This page in your language

فارسی

العربية

Deutsch

Español

Français

日本語

한국어

Português

中文

हिन्दी

A2 noun 11 min read

保质期

bao zhi qi

Practice it Examples Notes & Tips 保质期 in 30 Seconds

Explanation 保质期 in your Level:

At the A1 level, you should learn '保质期' (bǎozhìqī) as a very important word for shopping. It means 'shelf life'. Think of it as the 'safe time' for food. In China, when you buy food, you look for this word on the package. You will often see numbers like '30天' (30 days) or '12个月' (12 months) next to it. You don't need to use it in complex sentences yet. Just remember that '保' means protect, '质' means quality, and '期' means time. If you see this word, it is telling you how long the food is good. For example, if you see '保质期：7天', you must eat it within 7 days. It is a 'survival' word for living in China because it helps you not get sick from old food.

At the A2 level, you can start using '保质期' in simple sentences. You should know how to ask if something is still good to eat. A common phrase is '保质期到什么时候？' (When is the shelf life until?). You should also recognize that Chinese labels are different from Western ones. Instead of just one date, they show the 'production date' (生产日期) and then the 'shelf life' (保质期). You need to add them together. For example: '生产日期是1月1日，保质期是3天，所以1月4日过期。' (The production date is Jan 1st, the shelf life is 3 days, so it expires on Jan 4th). You can also use the verb '过期' (guòqī) which means 'to expire' or 'to be past the date'.

At the B1 level, you should be comfortable using '保质期' in various contexts, including shopping and household management. You can describe products using adjectives like '长' (long) or '短' (short). For example, '罐头食品的保质期通常很长' (Canned food usually has a long shelf life). You should also be able to understand warnings on packaging, such as '请在保质期内食用' (Please consume within the shelf life). At this level, you might also encounter the word in news stories about food safety or consumer rights. You should understand that if a store sells something '过了保质期' (past its shelf life), you have the right to return it or ask for a refund.

At the B2 level, you can use '保质期' metaphorically and in more formal discussions. You might discuss the 'shelf life' of a trend, a relationship, or a piece of technology. For example, '在这种快时尚文化中，衣服的保质期似乎越来越短了' (In this fast-fashion culture, the shelf life of clothes seems to be getting shorter and shorter). You should also be able to distinguish '保质期' from similar terms like '有效期' (validity period for medicine/documents) and '赏味期限' (best-before date for gourmet food). You can participate in debates about food waste, discussing whether '保质期' labels are too strict and lead to unnecessary throwing away of food.

At the C1 level, you should have a nuanced understanding of '保质期' within the context of Chinese regulations and industrial standards. You might read academic or legal texts that define '保质期' as the period during which the manufacturer is legally responsible for the product's quality. You can use the term in professional settings, such as food science, logistics, or marketing. You should be able to discuss complex concepts like 'accelerated shelf-life testing' (加速保质期测试) or the impact of packaging technology on '延长保质期' (extending shelf life). Your use of the word in metaphorical senses should be sophisticated, perhaps referencing literature or cinema where the term symbolizes the ephemeral nature of human experience.

At the C2 level, you master '保质期' as both a precise technical term and a versatile cultural metaphor. You can analyze the evolution of food safety laws in China and how the definition of '保质期' has changed over decades. You are capable of interpreting high-level philosophical discussions that use '保质期' to critique modern consumerism or the 'disposable' nature of contemporary society. You can switch effortlessly between the literal meaning on a milk carton and the abstract meaning in a poem. You understand the deep psychological impact that 'checking the date' has on the Chinese collective consciousness due to historical food safety concerns, and you can articulate these nuances in fluent, native-like discourse.

Practice it Examples Notes & Tips

保质期 in 30 Seconds

保质期 (bǎozhìqī) is the Chinese term for 'shelf life', indicating how long a product stays fresh and safe to use.
It is a compound of 'guarantee' (保), 'quality' (质), and 'period' (期), essential for food and cosmetic safety.
In China, labels often list the production date and shelf life duration separately, requiring consumers to calculate the expiry.
Metaphorically, it can refer to the temporary nature of abstract things like relationships, trends, or knowledge.

The term 保质期 (bǎozhìqī) is a critical noun in everyday Chinese life, particularly for anyone navigating the modern consumer landscape. At its core, it refers to the 'shelf life' or the 'guaranteed quality period' of a product. Whether you are buying a carton of milk, a tube of facial cream, or a bottle of vitamins, the 保质期 tells you how long the manufacturer guarantees that the product will remain safe, effective, and of high quality. In the context of food safety, it is the window during which the food is at its peak freshness and is safe for consumption under specified storage conditions.

Linguistic Breakdown: The word is composed of three characters: 保 (bǎo) meaning 'to protect' or 'to guarantee', 质 (zhì) meaning 'quality' or 'substance', and 期 (qī) meaning 'period' or 'phase'. Together, they literally translate to the 'period of guaranteed quality'.

超市里的牛奶快到保质期了，所以现在打折销售。(The milk in the supermarket is almost at the end of its shelf life, so it is on sale now.)

In China, the way 保质期 is presented on packaging differs slightly from Western 'Best Before' or 'Use By' dates. Most Chinese products will print the 生产日期 (shēngchǎn rìqī)—the production date—and then separately state the 保质期 as a duration, such as '18个月' (18 months) or '30天' (30 days). Consumers must then do the mental math to figure out if the product is still good. This makes the word 保质期 one of the most frequently scanned words on labels.

Broader Contexts: While primarily used for perishables, the term has migrated into metaphorical territory. People often talk about the 保质期 of a romantic relationship or even a career skill. It implies that everything has a peak period before it begins to degrade or lose its relevance.

爱情也有保质期吗？还是它可以永远新鲜？(Does love also have a shelf life? Or can it stay fresh forever?)

Understanding this word is essential for survival and health. If you accidentally consume something past its 保质期, you might experience 食物中毒 (shíwù zhòngdú) or food poisoning. Therefore, in any Chinese-speaking household, you will often hear parents or roommates asking, '这个过保质期了吗？' (Has this passed its shelf life?). It is a word that bridges the gap between commercial labeling and personal safety.

Cultural Nuance: In recent years, Chinese consumers have become extremely sensitive to 保质期 due to past food safety scandals. Checking the date has become a ritualistic behavior at supermarkets, often leading to people reaching for the very back of the shelf to find the items with the longest remaining 保质期.

购买化妆品时，除了看价格，更要注意保质期。(When buying cosmetics, besides looking at the price, you should pay more attention to the shelf life.)

In summary, 保质期 is not just a technical term found on the back of a box; it is a vital piece of information that dictates consumer behavior, health choices, and even philosophical reflections on the temporary nature of things in the modern world.

Using 保质期 correctly requires understanding its role as a noun and the common verbs that accompany it. The most frequent verbs used with this word are 看 (kàn - to look/check), 过 (guò - to pass/expire), and 有 (yǒu - to have). For example, if you want to say a product has a long shelf life, you would say it has a '长的保质期'. If it has expired, you say it has '过了保质期'.

Common Verb Pairings: 1. 检查保质期 (jiǎnchá bǎozhìqī): To check the shelf life.
2. 延长保质期 (yáncháng bǎozhìqī): To extend the shelf life (often used in manufacturing or food science).
3. 过了保质期 (guòle bǎozhìqī): Past the shelf life/Expired.

在买这罐蜂蜜之前，请务必检查一下它的保质期。(Before buying this jar of honey, please make sure to check its shelf life.)

When describing the length of the shelf life, 保质期 is often the subject of the sentence followed by 是 (shì - is) and a duration. For instance, '这袋面包的保质期是三天' (The shelf life of this bag of bread is three days). This structure is very common in customer service inquiries or when reading product descriptions online.

Adjective Modifiers: - 短 (duǎn - short): Used for fresh produce or dairy.
- 长 (cháng - long): Used for canned goods or dried foods.
- 即将到期 (jíjiāng dàoqī - about to expire): Used for items nearing their end date.

鲜奶的保质期通常很短，只有几天时间。(The shelf life of fresh milk is usually very short, only a few days.)

In a professional or scientific context, such as food manufacturing, 保质期 is used to discuss stability tests. You might hear engineers say, '我们需要通过实验来确定新产品的保质期' (We need to determine the shelf life of the new product through experiments). Here, the word acts as a technical parameter.

Negative Constructions: To express that something is not yet expired, use 在保质期内 (zài bǎozhìqī nèi), meaning 'within the shelf life'. Example: '只要在保质期内，你就可以放心食用' (As long as it is within the shelf life, you can eat it with peace of mind).

如果发现食品已经过了保质期，千万不要购买。(If you find that the food has already passed its shelf life, do not buy it.)

Finally, when dealing with legal or consumer rights issues, 保质期 is a key term. If a store sells a product past its 保质期, they are liable for a fine. You might use the phrase '索赔' (suǒpéi - to claim compensation) alongside 保质期 in these unfortunate situations. Mastery of these patterns ensures you can handle both daily errands and more complex social or legal interactions regarding product safety.

The word 保质期 is ubiquitous in Chinese society, echoing through various environments from the mundane to the high-stakes. The most common place is, of course, the 超市 (chāoshì - supermarket). You will hear customers whispering to each other as they squint at labels, or staff announcing discounts on items that are nearing their end. It's a word that dictates the rhythm of the shopping aisle.

In the Supermarket: Supermarket employees often use the phrase 临期产品 (línqī chǎnpǐn), which refers to products nearing their 保质期. You might hear a broadcast: '临期产品，买一送一！' (Products near expiration, buy one get one free!). Here, the concept of the shelf life is directly tied to economic value.

阿姨在超市里总是挑那些保质期最远的产品。(The auntie in the supermarket always picks the products with the furthest shelf life.)

In the domestic sphere, the kitchen is the primary theater for 保质期. Parents are the typical 'guardians' of the fridge, frequently checking the dates on eggs, sauces, and leftovers. You'll hear phrases like '快看看这个保质期到什么时候？' (Quick, check when the shelf life of this is until?). It's a word associated with care and health within the family.

In Media and Advertising: Television commercials for preservatives or vacuum-sealing machines often highlight how their technology can 延长保质期 (extend shelf life). On news programs, you might hear reports about 食品安全 (shípǐn ānquán - food safety) where 保质期 is mentioned in the context of regulatory crackdowns on unscrupulous vendors.

新闻报道了一些商家涂改食品保质期的违法行为。(The news reported on the illegal behavior of some businesses altering the shelf life of food.)

In the realm of 电子商务 (diànzǐ shāngwù - e-commerce), such as on platforms like Taobao or Meituan, customers often leave reviews complaining if a product arrived with a very short 保质期. You will see comments like '保质期不新鲜' (The shelf life isn't fresh—meaning the remaining time is too short). This shows how the word is a metric for customer satisfaction.

Metaphorical Use in Pop Culture: In movies and literature, particularly in the works of directors like Wong Kar-wai, 保质期 is used to symbolize the transience of emotions. A famous line from Chungking Express muses on whether everything in the world—even memories—has an expiration date. In this context, the word becomes poetic and melancholic.

在这个快节奏的时代，连友谊似乎都有了保质期。(In this fast-paced era, even friendship seems to have a shelf life.)

Whether it's a doctor warning a patient about the 保质期 of their medicine or a beauty blogger discussing the 保质期 of sunscreens, the word is a constant reminder of the physical and temporal limits of the objects we rely on every day.

For English speakers learning Chinese, several common pitfalls occur when using 保质期. The most frequent error is confusing it with the 'Expiration Date' itself. In English, we often say 'What is the expiration date?'. If you translate this literally into Chinese as '保质期是什么时候？', it's understandable but slightly imprecise. 保质期 refers to the duration (e.g., 12 months), while the specific date it expires is called the 到期日期 (dàoqī rìqī) or 失效日期 (shīxiào rìqī).

Mistake 1: Confusing Duration with Date: Incorrect: 我的牛奶保质期是2023年5月1日。
Correct: 我的牛奶到期日期是2023年5月1日，它的保质期是六个月。

别把保质期（时间长度）和到期日（具体日期）搞混了。(Don't confuse 'shelf life' (duration) with 'expiration date' (specific date).)

Another mistake is using 过期 (guòqī) as a noun. In English, we might say 'Check the expiration'. In Chinese, 过期 is a verb-object phrase meaning 'to pass the date'. You cannot say '检查过期'. You must say '检查保质期' or '看看是否过期'.

Mistake 2: Using 'Guòqī' as a Noun: Incorrect: 这个药的过期是什么？
Correct: 这个药的保质期到什么时候？ / 这个药过期了吗？

A third common error involves the word 生产日期 (shēngchǎn rìqī - production date). Because Chinese labels often list the production date and the shelf life duration separately, learners sometimes mistake the production date for the expiration date. This can lead to throwing away perfectly good food! Always look for the characters 生产 (produced) versus 保质 (guaranteed quality).

Mistake 3: Misreading the Label: Learners often see '2023/01/01' and think it's the end date. In China, this is almost always the start date. You must then find the 保质期: 12个月 to know it expires in 2024.

很多人以为包装上的日期就是最后一天，其实那是生产日期。(Many people think the date on the package is the last day, but it's actually the production date.)

Lastly, there is a nuance between 保质期 and 有效期 (yǒuxiàoqī - validity period). While they are often used interchangeably, 保质期 is preferred for food and cosmetics (quality focus), while 有效期 is strictly used for medicines, chemicals, and legal documents (effectiveness/validity focus). Using 保质期 for a passport or a contract would be a mistake; for those, you should use 有效期.

Mistake 4: Wrong Contextual Term: Incorrect: 签证的保质期是十年。
Correct: 签证的有效期是十年。

By keeping these distinctions in mind—duration vs. date, noun vs. verb, and food vs. documents—you will avoid the most common errors made by non-native speakers.

While 保质期 is the standard term for shelf life, several other words exist in the same semantic field. Understanding the subtle differences between them will help you sound more natural and precise in various situations.

1. 有效期 (yǒuxiàoqī): Meaning: Validity period or effective period.
Comparison: While 保质期 focuses on 'quality' (taste, texture, safety of food), 有效期 focuses on 'utility' or 'legal validity'. You use 有效期 for medicines (will the drug still work?), batteries, tickets, and legal documents like visas or IDs.

这盒感冒药的有效期到明年年底。(The validity period of this cold medicine is until the end of next year.)

2. 赏味期限 (shǎngwèi qīxiàn): Meaning: Best-before date (lit. 'period for appreciating taste').
Comparison: This is a loanword from Japanese (shōmi kigen). It is becoming popular in high-end Chinese supermarkets and trendy cafes. It specifically refers to the period during which the food tastes best, even if it remains safe to eat after that date. 保质期 is a more general, regulatory term.

这种手工巧克力只有七天的赏味期限。(This handmade chocolate only has a seven-day 'best taste' period.)

3. 保存期 (bǎocúnqī): Meaning: Storage life / Preservation period.
Comparison: This is often used synonymously with 保质期 but emphasizes the 'storage' aspect. In some older regulations, 保存期 referred to the absolute last date a product could be consumed safely, whereas 保质期 was the date it remained in peak condition. Today, 保质期 has largely replaced it in common parlance.

4. 使用期限 (shǐyòng qīxiàn): Meaning: Service life / Period of use.
Comparison: This is used for non-consumable goods like electronics, machinery, or credit cards. It refers to how long the item is expected to function correctly. You wouldn't say a computer has a 保质期; you would say it has a 使用期限 or 寿命 (shòumìng - lifespan).

这张优惠券的使用期限截止到本月底。(The period of use for this coupon ends at the end of this month.)

Choosing the right word shows your level of Chinese proficiency. While 保质期 will get you through most grocery shopping trips, knowing when to switch to 有效期 or 赏味期限 adds a layer of sophistication to your speech and ensures you are following the specific nuances of Chinese consumer culture.

How Formal Is It?

Fun Fact

Before industrial labeling was standardized in China, people relied on 'smell and sight' (闻和看). The introduction of '保质期' as a legal requirement on labels changed how an entire generation relates to food safety.

Pronunciation Guide

UK /baʊ dʒiː tʃiː/

US /baʊ dʒi tʃi/

The primary stress is on the first syllable 'Bǎo', with a sharp drop on 'zhì' and a sustained high pitch on 'qī'.

Rhymes With

周期 (zhōuqī) 学期 (xuéqī) 日期 (rìqī) 星期 (xīngqī) 预期 (yùqī) 假期 (jiàqī) 定期 (dìngqī) 延期 (yánqī)

Common Errors

Pronouncing 'zhi' like English 'zee'. It should be a retroflex sound with the tongue curled back.
Missing the 3rd tone on 'Bao', making it sound like 'Bāo' (1st tone - bag).
Confusing 'qi' with 'xi'. 'Qi' is an aspirated 'ch' sound.
Failing to drop the tone sufficiently on the 4th tone 'zhì'.
Pronouncing 'bao' as 'bay-oh'. It should rhyme with 'how'.

Difficulty Rating

Reading 2/5

The characters are common and the word appears frequently on packaging.

Writing 3/5

The character '质' can be tricky for beginners to write correctly.

Speaking 2/5

Easy to pronounce once you master the retroflex 'zh' and the tones.

Listening 2/5

Very distinct sound, commonly heard in grocery stores.

What to Learn Next

Prerequisites

生产 (shēngchǎn) 日期 (rìqī) 质量 (zhìliàng) 时间 (shíjiān) 食物 (shíwù)

Learn Next

有效期 (yǒuxiàoqī) 防腐剂 (fángfǔjì) 变质 (biànzhì) 发霉 (fāméi) 新鲜 (xīnxiān)

Advanced

微生物 (wēishēngwù) 稳定性 (wěndìngxìng) 追溯 (zhuīsù) 合规 (héguī)

Grammar to Know

Noun as an Attribute

保质期标签 (Shelf life label) - Here '保质期' describes the type of label.

Duration Phrases

保质期[时间] - e.g., 保质期六个月 (Shelf life [is] six months). No 'is' required in short labels.

Resultative Complements

过期了 (Expired) - '过' is the verb, '期' is the object, '了' indicates a change of state.

Prepositional Phrases with '在...内'

在保质期内 (Within the shelf life) - Standard way to express a time window.

Verb-Object Structures

过保质期 (To pass the shelf life) - Functions as a single conceptual unit.

Examples by Level

保质期是几天？

How many days is the shelf life?

Simple question structure using '是' (is).

保质期：六个月。

Shelf life: six months.

Noun followed by a duration.

这个保质期很短。

This shelf life is very short.

Using the adjective '短' (short) to describe the noun.

请看保质期。

Please look at the shelf life.

Imperative sentence with '请' (please).

保质期在哪儿？

Where is the shelf life (date)?

Question using '在哪儿' (where).

面包的保质期是三天。

The bread's shelf life is three days.

Possessive '的' connecting the object and its attribute.

还没过保质期。

It hasn't passed the shelf life yet.

Using '还没' (not yet) with the verb '过' (to pass).

保质期：2024年。

Shelf life: Year 2024.

Indicating a year as the limit.

这瓶水的保质期到什么时候？

When is the shelf life of this bottle of water until?

Using '到什么时候' to ask for the end point.

牛奶过了保质期，不能喝了。

The milk is past its shelf life, it can't be drunk anymore.

Verb-object '过了保质期' followed by a result.

买东西的时候要先看保质期。

When buying things, you should check the shelf life first.

Using '的时候' (when) and '要' (should).

这个蛋糕的保质期只有二十四小时。

This cake's shelf life is only twenty-four hours.

Using '只有' (only) to emphasize a short duration.

过保质期的食品不要吃。

Don't eat food that is past its shelf life.

Adjective phrase '过保质期的' modifying '食品'.

这家超市的肉保质期都很新鲜。

The meat in this supermarket has very fresh shelf lives.

Using '新鲜' (fresh) to describe the state of the shelf life.

这种饼干的保质期是一年吗？

Is the shelf life of these cookies one year?

Simple '吗' question.

请帮我看看这个保质期。

Please help me look at this shelf life.

Verb reduplication '看看' for a casual request.

由于保质期快到了，这些酸奶正在打折。

Since the shelf life is almost up, these yogurts are on discount.

Using '由于...正在...' to show cause and effect.

你应该把快过保质期的食物放在冰箱外面。

You should put food that is about to expire outside the fridge (to use first).

Complex '把' construction.

这种化妆品开封后的保质期是六个月。

The shelf life of this cosmetic after opening is six months.

Using '开封后' (after opening) as a condition.

厂家通过添加防腐剂来延长产品的保质期。

Manufacturers extend the shelf life of products by adding preservatives.

Using '通过...来...' (by means of... to...).

虽然这包零食过了保质期，但看起来还没坏。

Although this bag of snacks is past its shelf life, it doesn't look spoiled yet.

Conjunction '虽然...但...' (although... but...).

请务必在保质期内食用，以保证口感。

Please be sure to consume within the shelf life to guarantee the taste.

Using '以' to indicate purpose.

如果我们买了过保质期的商品，可以要求退货。

If we buy goods past their shelf life, we can request a return.

Conditional '如果...可以...'.

这种罐头的保质期长达三年之久。

The shelf life of this canned food is as long as three years.

Using '长达...之久' for emphasis.

很多人认为爱情也有保质期，热情总会消退。

Many people believe that love also has a shelf life, and passion will eventually fade.

Metaphorical use of '保质期'.

超市设立了“临期产品专柜”，专门处理快过保质期的食品。

The supermarket set up a 'near-expiry counter' specifically to handle food near its shelf life.

Using '设立' (set up) and '专门' (specially).

这种疫苗对存储温度要求极高，否则会缩短保质期。

This vaccine has extremely high storage temperature requirements, otherwise, its shelf life will be shortened.

Using '否则' (otherwise) and '缩短' (shorten).

我们在购买进口食品时，一定要注意保质期的标注方式。

When buying imported food, we must pay attention to the way the shelf life is labeled.

Using '标注方式' (labeling method).

知识的保质期在信息时代变得越来越短了。

The shelf life of knowledge has become shorter and shorter in the information age.

Abstract application of the noun.

即使在保质期内，如果储存不当，食物也会变质。

Even within the shelf life, if stored improperly, food will still spoil.

Using '即使...也...' (even if... still...).

商家不得销售超过保质期的食品，这是法律明文规定的。

Merchants must not sell food that exceeds its shelf life; this is clearly stipulated by law.

Using '不得' (must not) and '明文规定' (clearly stipulated).

为了延长保质期，这种水果在运输前经过了特殊处理。

In order to extend the shelf life, this fruit underwent special treatment before transport.

Passive/Process description with '经过'.

食品保质期的确定是一个涉及微生物学和化学稳定性的复杂过程。

Determining the shelf life of food is a complex process involving microbiology and chemical stability.

Formal academic sentence structure.

在这一语境下，“保质期”被赋予了某种存在主义的荒诞色彩。

In this context, 'shelf life' is endowed with a certain existentialist sense of the absurd.

Literary/Philosophical register.

该政策旨在规范市场上关于保质期虚假标注的乱象。

The policy aims to regulate the chaos of false shelf-life labeling in the market.

Using '旨在' (aims to) and '规范' (regulate).

消费者往往容易混淆“保质期”与“保存期”这两个法律概念。

Consumers often tend to confuse the two legal concepts of 'shelf life' and 'preservation period'.

Using '往往容易混淆' (often easily confused).

企业若想在竞争中脱颖而出，必须在不牺牲保质期的前提下减少添加剂。

If an enterprise wants to stand out in the competition, it must reduce additives without sacrificing shelf life.

Using '在...的前提下' (under the premise of...).

随着真空包装技术的革新，许多生鲜产品的保质期得到了质的飞跃。

With the innovation of vacuum packaging technology, the shelf life of many fresh products has achieved a qualitative leap.

Idiomatic expression '质的飞跃' (qualitative leap).

法律专家指出，销售过期食品不仅违约，更构成对消费者健康的侵权。

Legal experts point out that selling expired food is not only a breach of contract but also constitutes an infringement on consumer health.

Using '不仅...更...' for progressive emphasis.

保质期的长短往往成为衡量一种食品加工水平的关键指标。

The length of the shelf life often becomes a key indicator for measuring the level of food processing.

Using '衡量' (measure) and '指标' (indicator).

在王家卫的电影里，凤梨罐头的保质期不仅是时间的刻度，更是情感幻灭的隐喻。

In Wong Kar-wai's films, the shelf life of canned pineapples is not just a measure of time, but a metaphor for emotional disillusionment.

High-level cultural analysis.

对于某些陈年普洱而言，传统的保质期概念在岁月的醇化面前显得苍白无力。

For certain aged Pu-erh teas, the traditional concept of shelf life appears pale and weak in the face of years of mellowing.

Literary personification '苍白无力'.

这种“保质期式”的社交逻辑，折射出当代都市人对长期承诺的普遍焦虑。

This 'shelf-life style' social logic reflects the general anxiety of contemporary urbanites regarding long-term commitment.

Sociological critique using the term as an adjective.

监管部门应严厉打击通过非法手段更改保质期的“僵尸肉”流向餐桌。

Regulatory departments should severely crack down on 'zombie meat' that flows to the table by illegally changing the shelf life.

Using the slang '僵尸肉' (zombie meat) in a formal legal context.

该研究探讨了纳米包装材料在动态环境下对水产品保质期的实时监控作用。

The study explored the real-time monitoring role of nano-packaging materials on the shelf life of aquatic products in dynamic environments.

Highly technical academic language.

倘若万物皆有保质期，那么我们对永恒的追求是否注定只是一场徒劳？

If all things have a shelf life, then is our pursuit of eternity destined to be just a futile effort?

Philosophical rhetorical question using '倘若' (if).

供应链的透明化使得消费者能够追溯产品从生产到保质期截止的每一个环节。

The transparency of the supply chain allows consumers to trace every link of the product from production to the end of its shelf life.

Using '追溯' (trace) and '环节' (link/segment).

在极端气候影响下，全球粮食储备的保质期管理正面临前所未有的严峻挑战。

Under the influence of extreme climate, the shelf-life management of global food reserves is facing unprecedented severe challenges.

Global-scale geopolitical/environmental discussion.

Common Collocations

延长保质期

过了保质期

检查保质期

在保质期内

短保质期

长保质期

标明保质期

计算保质期

临近保质期

涂改保质期

Common Phrases

保质保量

— To guarantee both quality and quantity. Often used in work contexts.

我们要保质保量地完成任务。

保质期过期

— The shelf life has expired. Redundant but used in speech.

这个保质期过期了。

新鲜保质期

— The period of peak freshness.

我们要抓住新鲜保质期。

爱情保质期

— The 'shelf life' of a romantic relationship.

你相信爱情保质期吗？

食品保质期

— The shelf life specifically for food items.

食品保质期是消费者最关心的。

药品保质期

— The shelf life for medicine (though 有效期 is better).

不要服用超过保质期的药品。

化妆品保质期

— The shelf life for beauty products.

化妆品也有保质期，开封后要快点用。

保质期标注

— The labeling of the shelf life.

保质期标注不清晰会误导消费者。

延长保质期技术

— Technology used to extend shelf life.

这家公司研发了新的延长保质期技术。

保质期预警

— An early warning for items nearing expiration.

系统会自动发出保质期预警。

Often Confused With

保质期 vs 生产日期

Production date. Learners often confuse the start date with the end date.

保质期 vs 有效期

Validity period. Used for medicine and documents rather than food.

保质期 vs 赏味期限

Best-before date. A focus on taste rather than just safety.

Idioms & Expressions

"物换星移"

— Things change and stars move; used to describe the passage of time which affects all 'shelf lives'.

物换星移，曾经的流行现在已经过了保质期。

Literary

"昙花一现"

— A flash in the pan; describes things with a very short 'shelf life' or existence.

这种网络红人往往只是昙花一现，保质期很短。

Informal/Literary

"经久不衰"

— Enduring and never fading; the opposite of having a short shelf life.

这部经典电影经久不衰，没有保质期。

Formal

"明日黄花"

— Chrysanthemums after the Double Ninth Festival; something that is past its prime or 'shelf life'.

这些过时的技术已经成了明日黄花。

Literary

"历久弥新"

— The older it gets, the fresher it becomes; used for things like tea or wisdom that improve over time.

好的友谊历久弥新，没有保质期。

Formal

"过时货"

— Outdated goods; items past their 'shelf life' in terms of fashion or utility.

这种款式的衣服早就是过时货了。

Slang/Informal

"陈年旧事"

— Old stories/matters from years ago; things that have long since 'expired'.

那些都是陈年旧事了，不要再提了。

Neutral

"半老徐娘"

— A middle-aged woman who still retains her charm; often used to discuss the 'shelf life' of beauty.

她虽然已是半老徐娘，但风韵犹存。

Literary/Informal

"日新月异"

— Change with each passing day; why technology has a short shelf life.

在这个日新月异的时代，产品更新很快。

Formal

"弹指之间"

— In the blink of an eye; how quickly a short shelf life passes.

假期在弹指之间就结束了。

Literary

Easily Confused

保质期 vs 过期

Both relate to the end of a product's life.

'保质期' is the noun (the period), while '过期' is usually a verb or adjective (the state of being past the date). You check the '保质期', but the food is '过期'.

检查保质期后，我发现它过期了。

保质期 vs 到期

Both involve time limits.

'到期' is used for deadlines, contracts, or specific dates (to fall due), while '保质期' is specifically for quality duration.

合同到期了，但面包还没过保质期。

保质期 vs 周期

Both refer to a period of time.

'周期' refers to a cycle (like a biological or economic cycle), while '保质期' is a linear countdown to spoilage.

月亮的运行有一个周期，但牛奶只有一个保质期。

保质期 vs 限期

Both imply a time limit.

'限期' is a set deadline imposed by an authority (e.g., 'limit to 10 days to finish'), while '保质期' is an inherent property of the product.

政府限期超市清理过保质期的食品。

保质期 vs 保存

Both relate to keeping things.

'保存' is the action of preserving, while '保质期' is the time allowed for that quality to last.

如果你保存得好，可以延长保质期。

Sentence Patterns

保质期是[时间]。

保质期是三天。

[物品]过了保质期。

牛奶过了保质期。

请在保质期内[动作]。

请在保质期内食用。

由于[原因]，保质期变短了。

由于天气热，保质期变短了。

[抽象事物]也有保质期。

友谊也有保质期。

通过[方法]来延长保质期。

通过冷冻来延长保质期。

保质期的确定取决于[因素]。

保质期的确定取决于包装材料。

在[背景]下，保质期成为了[隐喻]。

在消费主义下，保质期成为了人际关系的隐喻。

Word Family

Nouns

质量 (zhìliàng - quality)

期间 (qījiān - period)

保证 (bǎozhèng - guarantee)

保质 (bǎozhì - quality preservation)

Verbs

保持 (bǎochí - to maintain)

保护 (bǎohù - to protect)

过期 (guòqī - to expire)

到期 (dàoqī - to become due)

Adjectives

优质 (yōuzhì - high quality)

变质 (biànzhì - spoiled/degenerated)

长期 (chángqī - long term)

短期 (duǎnqī - short term)

生产日期 (shēngchǎn rìqī)

失效日期 (shīxiào rìqī)

防腐剂 (fángfǔjì)

真空包装 (zhēnkōng bāozhuāng)

食品安全 (shípǐn ānquán)

How to Use It

frequency

Extremely high in daily life, especially in retail and domestic settings.

Common Mistakes

Using '保质期' to mean 'expired'. → 过期 (guòqī)
Learners often say '这个蛋糕保质期了' (This cake is shelf life). You should say '这个蛋糕过期了' (This cake has expired).
Confusing '保质期' with '生产日期'. → Separate them clearly.
Learners see a date and think it's the expiry. If it says 2023.01.01, that's usually the day it was made, not the day it dies.
Using '保质期' for a passport or visa. → 有效期 (yǒuxiàoqī)
A passport doesn't 'spoil' in quality; it loses its legal 'validity'. Use '有效期' for documents.
Saying '保质期是什么时候？' → 保质期是多久？ / 到期日是什么时候？
Since '保质期' is a duration, 'how long' (多久) is more appropriate than 'when' (什么时候).
Forgetting the 4th tone on 'zhì'. → bǎozhìqī (3, 4, 1)
If you say 'bǎozhīqī' (3, 1, 1), it sounds like 'protect the period of juice', which is nonsensical.

Tips

The 'Back of the Shelf' Rule

In Chinese supermarkets, staff often put the newest items (with the longest remaining 保质期) at the very back of the shelf. Don't be afraid to reach back!

Noun vs Verb

Always remember that 保质期 is a noun. You check it. 过期 is the result. Don't mix them up in a sentence like 'It is shelf life' when you mean 'It is expired'.

Trust the Date

Due to strict food safety laws, most major supermarkets are very careful about 保质期. If you find an expired item, you can often get a reward or refund.

Related Units

Learn the time units often used with 保质期: 天 (days), 月 (months), and 年 (years) to quickly understand labels.

Storage Matters

The 保质期 only applies if the food is stored as directed (e.g., '冷藏' - refrigerated). If you leave milk in the sun, the 保质期 doesn't matter anymore!

Poetic Usage

Use 保质期 when talking about feelings or trends to sound more like a native speaker who understands modern Chinese pop culture.

Find the Stamp

Sometimes the 保质期 is printed in a faint blue or black ink that's hard to see. Look for '见封口' (see the seal) or '见瓶底' (see the bottle bottom).

Consumer Rights

If you are sold something past its 保质期, the phrase to use is '索赔' (suǒpéi) - to claim compensation. China has strict '10x refund' laws for expired food.

Freshness First

Even if the 保质期 is long, Chinese consumers value '新鲜' (freshness). A product with 1 day left is '不新鲜' even if it hasn't expired yet.

Character Practice

Practice writing '保' (protect) and '期' (period) as they are extremely common in hundreds of other Chinese words.

Memorize It

Mnemonic

Bǎo (Protect) your Zhì (Quality) for a Qī (Period). Imagine a security guard (Bao) protecting a high-quality (Zhi) diamond inside a clock (Qi).

Visual Association

Picture a milk carton with a giant clock face on it. The clock hands show how much 'time' the quality has left.

Word Web

Food Supermarket Safety Date Quality Expired Health Label

Challenge

Go to your kitchen, find three items with Chinese labels, and identify their **保质期**. Calculate the exact date they will expire based on the **生产日期**.

Word Origin

The word is a modern compound formed during the industrialization of food production in China. It combines the traditional concepts of 'guaranteeing' (保) and 'quality' (质) with 'period' (期).

Original meaning: The literal meaning is 'the period during which quality is guaranteed'.

Sino-Tibetan (Mandarin Chinese).

Cultural Context

Be careful when discussing food safety scandals in China; it can be a sensitive topic, though checking the date itself is a standard, non-controversial action.

Westerners are used to 'Best Before' or 'Use By' dates. In China, you must find the duration and the start date separately, which can be confusing at first.

The movie 'Chungking Express' (重度森林) by Wong Kar-wai, where the protagonist obsesses over the shelf life of pineapple cans. Common internet slang: '我们的友谊过了保质期' (Our friendship has passed its shelf life). Consumer Rights Day (March 15th) in China often features reports on altered '保质期' labels.

Practice in Real Life

Real-World Contexts

Grocery Shopping

保质期多久？
这个还没过保质期吧？
我想买保质期长一点的。
保质期在哪儿印着？

Cooking at Home

冰箱里的肉过保质期了。
调料的保质期一般都很长。
快看看这鸡蛋的保质期。
开封后保质期会变短。

Skincare/Makeup

防晒霜的保质期是一年。
没开封的保质期是三年。
过保质期的化妆品会过敏。
记得标记开封日期和保质期。

Medical/Pharmacy

药品的保质期非常重要。
这盒感冒药刚过保质期。
一定要看清楚有效期和保质期。
过期的药不能随便扔。

Metaphorical/Social

流行语的保质期很短。
我们的友谊没有保质期。
他的耐心已经过了保质期。
知识也有保质期，要不断学习。

Conversation Starters

"你在买东西的时候会仔细看保质期吗？ (Do you check the shelf life carefully when buying things?)"

"你觉得罐头食品的保质期太长了吗？ (Do you think the shelf life of canned food is too long?)"

"如果你发现买了过保质期的东西，你会回去找商店吗？ (If you found you bought something past its shelf life, would you go back to the store?)"

"你相信爱情有保质期吗？为什么？ (Do you believe love has a shelf life? Why?)"

"你通常怎么处理家里快过保质期的食物？ (How do you usually handle food at home that is about to expire?)"

Journal Prompts

写一写你曾经不小心吃到过保质期食物的经历。 (Write about an experience where you accidentally ate food past its shelf life.)

讨论一下现代科技如何通过延长保质期来改变我们的饮食习惯。 (Discuss how modern technology changes our eating habits by extending shelf life.)

反思一下：如果人的记忆也有保质期，你会选择记住什么？ (Reflect: If human memory also had a shelf life, what would you choose to remember?)

描述一次你在超市挑选最远保质期产品的心理活动。 (Describe your mental process of picking the product with the furthest shelf life in a supermarket.)

你认为“保质期”这个概念在人际关系中意味着什么？ (What do you think the concept of 'shelf life' means in interpersonal relationships?)

Frequently Asked Questions

10 questions

Look for the characters '保质期'. Usually, it will be followed by a number and a unit of time like '天' (days) or '个月' (months). Then, find the '生产日期' (production date) elsewhere on the package and add the two together. For example, if produced on Jan 1 and the shelf life is 30 days, it expires on Jan 31.

In Chinese regulations, '保质期' is the period where the manufacturer guarantees quality. One day past might not make it poisonous immediately (similar to a 'Best Before' date), but the store is legally forbidden from selling it, and consumption is at your own risk. Fresh items like milk should be avoided immediately after the date.

'保质期' is used for food, drinks, and cosmetics, focusing on 'quality'. '有效期' is used for medicines, batteries, and legal documents like visas, focusing on 'effectiveness' or 'legal validity'. You wouldn't say your passport has a '保质期'.

Literally, no. Clothes don't spoil like food. However, in a metaphorical sense, you can say a fashion trend has a short '保质期' to mean it goes out of style quickly. Formally, you would use '使用寿命' for the physical durability of the garment.

This means 'Shelf life: see packaging'. It's a placeholder on the main label telling you that the specific date or duration is stamped elsewhere, usually on the seal of the bag or the bottom of the can.

'临期食品' (línqī shípǐn) refers to food that is very close to its '保质期' end date. Many supermarkets in China have special sections for these items where they are sold at a deep discount.

Not exactly. '保质期' is the standard regulatory term. '赏味期限' is a more poetic term (Best Before) that focuses on the period of best taste. A product might pass its '赏味期限' but still be within its '保质期'.

No, it is strictly a noun. To express the action of expiring, use the verb '过期' (guòqī). You cannot say '这个牛奶保质期了', you must say '这个牛奶过期了'.

You say '延长保质期' (yáncháng bǎozhìqī). This is commonly used when talking about preservatives, vacuum sealing, or refrigeration.

Pure honey theoretically lasts forever, but Chinese law requires all food products to have a '保质期' on the label. Usually, it is listed as 2 years (24 months), even though the honey may remain good for much longer.