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A2 verb 8 min read

腐烂

fulan

Practice it Examples Notes & Tips 腐烂 in 30 Seconds

Explanation 腐烂 in your Level:

At the A1 level, you only need to know that '腐烂' (fǔlàn) means 'rotten' or 'bad' in the context of food. Imagine you have an apple on your table. If you don't eat it for a very long time, it turns brown and soft. You can say '苹果腐烂了' (The apple is rotten). At this stage, just focus on using it with simple nouns like fruit (水果), meat (肉), or vegetables (蔬菜). It is a useful word for talking about things you should throw away. You might hear it in a kitchen or at a supermarket. Remember the sound: 'fǔ' (like 'food' but with a dipping tone) and 'làn' (like 'lan' in 'land' but with a sharp falling tone). Don't worry about the complex characters yet; just recognize that they mean something is no longer fresh and is starting to smell bad.

As an A2 learner, you can start using '腐烂' (fǔlàn) in slightly more complex sentences. You should understand that it is a verb that describes a change. For example, '因为天气热，肉腐烂得很快' (Because the weather is hot, the meat rots very quickly). You can also use it to describe why you are doing something, like '把腐烂的菜扔掉' (Throw away the rotten vegetables). At this level, you should notice that '腐烂' is more formal than just saying '坏了' (huài le). If you say '这个苹果坏了', it might just be bruised. If you say '这个苹果腐烂了', it is definitely decomposing. You can also start to use it with environmental words like '树叶' (shùyè - leaves) in the forest. It helps you describe nature and basic hygiene.

At the B1 level, you should be comfortable using '腐烂' (fǔlàn) in both literal and mildly figurative ways. You can describe processes: '细菌导致了食物的腐烂' (Bacteria caused the food to rot). You will also encounter '腐烂' in reading passages about the environment or biology, where it explains how nutrients return to the soil. Furthermore, you might see it used to describe a smell—'腐烂的味道' (the smell of rot). You should also begin to recognize its use in describing things that are metaphorically 'decaying', such as a very old, neglected building or a 'rotting' friendship, although this is less common than the physical meaning. You should be able to distinguish '腐烂' from '变质' (spoiled quality) and '发霉' (moldy).

By B2, you should understand the metaphorical depth of '腐烂' (fǔlàn). It is frequently used in literature and news to describe social and political issues. For example, '这个制度已经从内部开始腐烂了' (This system has already begun to rot from the inside). This level requires you to understand the nuance that '腐烂' implies an internal, natural, and often inevitable decline. You will see it in historical contexts, describing the end of a dynasty or the moral decay of a society. You should also be able to use it as a noun in formal writing, such as '防止腐烂' (preventing decay). Your vocabulary should now include related terms like '腐败' (corruption) and you should know when to choose '腐烂' to create a more vivid, visceral image of destruction.

At the C1 level, you are expected to use '腐烂' (fǔlàn) with precision in academic and literary contexts. You should understand its role in philosophical discussions about life, death, and the cycle of existence. For instance, you might analyze a poem where '腐烂' represents the passage of time or the beauty in decay. You should also be familiar with technical uses in fields like archaeology (e.g., the '腐烂' of organic remains) or environmental science. At this stage, you can use the word to create specific tones—using it to evoke disgust, tragedy, or even a sense of natural order. You should also be able to handle complex grammatical structures, such as using '腐烂' in passive constructions or as part of intricate set phrases and idioms that describe the disintegration of complex structures.

At the C2 level, you possess a native-like grasp of '腐烂' (fǔlàn). you can use it to articulate subtle distinctions in meaning across various domains, from high-level political analysis to avant-garde literature. You understand the historical evolution of the characters and can use this knowledge to appreciate puns or classical allusions. You can discuss the '腐烂' of language itself—how words lose their meaning over time—or the '腐烂' of entire civilizations in a grand historical narrative. Your usage is effortless, whether you are describing the precise biological stage of a specimen or the existential dread of a character in a novel. You can also critique the use of the word in media, recognizing when it is used for sensationalism versus when it is a precise description of a systemic failure.

Practice it Examples Notes & Tips

腐烂 in 30 Seconds

腐烂 (fǔlàn) means to rot or decompose physically.
It is used for organic things like food, wood, and bodies.
It can also mean metaphorical 'rot' in society or morals.
It is more formal than the common word '坏了' (huài le).

The Chinese word 腐烂 (fǔlàn) is a multi-faceted verb and adjective that primarily describes the biological process of decomposition. At its core, it refers to organic matter—such as food, wood, or carcasses—breaking down due to the action of bacteria and fungi. However, its utility in the Chinese language extends far beyond the compost bin. Understanding 腐烂 requires a grasp of both its literal physical state and its metaphorical applications in social and moral contexts.

Literal Biological Decay: In everyday life, you will most frequently encounter this word when discussing perishable goods. If you leave a bag of oranges in a warm corner for two weeks, they will undergo 腐烂. The word implies a transition from a state of freshness and structural integrity to one of softness, foul odor, and waste. It is a more formal and clinical term than the simple 烂 (làn), which is often used in casual conversation to mean 'broken' or 'mushy'.

森林里的落叶正在缓慢地腐烂，变成了肥沃的土壤。(The fallen leaves in the forest are slowly rotting, turning into fertile soil.)

Metaphorical Social Rot: Beyond the physical, 腐烂 is a powerful tool for social critique. It describes the decline of a system, an organization, or a person's character. When a government becomes so entrenched in bribery and nepotism that it no longer functions for the people, Chinese writers describe the administration as 腐烂. It suggests a deep-seated, internal destruction that might not be visible from the outside until it is too late. This usage is common in historical dramas and political news.

这个贪婪的官员让整个部门都腐烂了。(This greedy official has caused the entire department to rot.)

The character 腐 (fǔ) itself is fascinating; it consists of the 'meat' radical under a 'government office' or 'storehouse' roof, originally hinting at meat stored too long until it spoiled. This etymological root perfectly bridges the gap between the kitchen and the capitol. The second character 烂 (làn) features the 'fire' radical, which historically referred to something being cooked until it was soft, and eventually evolved to mean 'rotten' or 'worn out'. Together, they form a vivid image of something losing its essence and becoming useless. In modern Mandarin, it is a versatile word essential for describing everything from environmental cycles to the tragic downfall of empires.

Using 腐烂 (fǔlàn) correctly involves understanding its role as an intransitive verb and its placement in resultative structures. Because decay is a process that happens to an object, it often appears with the particle 了 (le) to indicate a change of state or the completion of the process. It is rarely used as a transitive verb where one thing 'rots' another; instead, we use causative constructions like 使 (shǐ) or 让 (ràng).

Standard Subject-Verb Pattern: The most basic way to use the word is [Noun] + [腐烂] + [了]. This is used for simple observations of decay. For example, 'The meat is rotten' becomes '肉腐烂了'. This structure is direct and clear.

因为天气太潮湿，木头已经开始腐烂了。(Because the weather is too humid, the wood has already started to rot.)

Using 腐烂 as an Adjective: When you want to describe a noun using 'rotten' as a property, you use the particle 的 (de). For example, 'rotten smell' is '腐烂的味道'. This is common when describing environments or sensory experiences.

我闻到了一股腐烂的气息，附近一定有死鱼。(I smelled a scent of rot; there must be dead fish nearby.)

In more complex sentences, 腐烂 can be part of a resultative complement. For instance, if you want to say something 'rotted to pieces', you might say 腐烂掉了 (fǔlàn diào le). In abstract contexts, it is frequently used in the form of 道德腐烂 (dàodé fǔlàn) meaning 'moral decay'. When writing about history or literature, you might see it used to describe the 'rotting' of a dynasty, implying that the failure came from within. Always remember that 腐烂 carries a strong negative connotation, except in ecological contexts where it is seen as a necessary part of the cycle of life.

Identifying where 腐烂 (fǔlàn) appears in real-world Chinese conversation helps you master its register. It is not a word you use for a slightly bruised apple—that would just be 坏了 (huài le). 腐烂 is reserved for more significant or scientific descriptions of decay.

In the Kitchen and Market: You will hear this from a concerned parent or a market vendor explaining why a product is being thrown away. '这些蔬菜已经腐烂了，不能卖了' (These vegetables have already rotted and cannot be sold). It sounds more definitive and 'gross' than just saying they are bad.

由于冰箱坏了，里面的肉全都腐烂发臭了。(Because the fridge broke, the meat inside all rotted and started to stink.)

News and Political Discourse: In Chinese news broadcasts, particularly those focusing on anti-corruption campaigns (反腐 - fǎnfǔ), you will hear derivatives of this word. While 'corruption' is usually 腐败 (fǔbài), journalists often use 腐烂 to describe the state of a system that has lost its integrity. It evokes a visceral image of a 'rotting' institution.

Finally, in literature and cinema, particularly in the 'Noir' or 'Horror' genres, 腐烂 is used to build atmosphere. A 'rotting mansion' or a 'rotting corpse' creates a sense of dread and finality. It is also used in philosophical discussions about the transience of life. When you hear this word, pay attention to whether the speaker is talking about a physical object or an abstract concept, as the emotional weight changes significantly between the two.

Learning 腐烂 (fǔlàn) comes with a few pitfalls, especially because English often uses 'rotten' or 'spoiled' interchangeably, while Chinese has more specific terms for different types of 'badness'.

Mistake 1: Overusing it for minor food issues: If your milk is slightly sour, do not say it is 腐烂. Instead, use 变质 (biànzhì) or simply 酸了 (suān le). 腐烂 implies a physical breakdown, mold, or liquefaction. Using it for sour milk sounds dramatic and linguistically inaccurate.

错误用法：这瓶牛奶腐烂了。(Wrong: This bottle of milk is rotten.) -> 正确：这瓶牛奶变质了。

Mistake 2: Confusing 腐烂 with 腐败: While both words share the character 腐, 腐败 (fǔbài) is the standard term for political corruption or bribery. You can use 腐烂 metaphorically to describe a 'rotting' society, but if you are talking about a specific official taking money, 腐败 is the correct technical term.

Another common error is forgetting that 腐烂 is generally intransitive. You cannot 'rot' something in Chinese. Instead of saying 'The water rotted the wood', you must say '水使木头腐烂了' (The water caused the wood to rot). Beginners often try to map English transitive patterns directly onto Chinese, which results in awkward phrasing. Lastly, be careful with the pronunciation: both syllables are in the third and fourth tones respectively (fǔ-làn). Mispronouncing the tones can lead to confusion with other words like 'fúlán' (not a standard word but sounds like 'floating orchid').

To truly master 腐烂 (fǔlàn), you must see how it sits alongside its linguistic cousins. Here is a comparison of common synonyms and related terms.

腐烂 vs. 变质 (biànzhì): 腐烂 focuses on the physical decay and decomposition of organic matter. 变质 (literally 'change quality') is broader and refers to any food or chemical substance that has gone bad, lost its original properties, or become unsafe to consume, even if it hasn't visibly 'rotted' yet.

腐烂 vs. 腐蚀 (fǔshí): 腐蚀 means 'corrode' or 'erode'. While 腐烂 is for biological things, 腐蚀 is for metals (rusting) or stones (acid rain). Metaphorically, both can describe moral decay, but 腐蚀 implies an external force eating away at something, while 腐烂 implies an internal breakdown.

海水腐蚀了铁船，而船里的食物早已腐烂。(The seawater corroded the iron ship, while the food inside had long since rotted.)

腐烂 vs. 堕落 (duòluò): When talking about people, 腐烂 is a very harsh way to describe a lack of morals. 堕落 means 'to fall' or 'to degenerate'. 堕落 is more common for describing a person's lifestyle choices (like gambling or drugs), while 腐烂 describes the resulting state of their soul or character.

In summary, choose 腐烂 when you want to emphasize the gross, physical process of decomposition or the deep, internal 'stink' of a failing system. Use 变质 for general food safety, 腐蚀 for chemistry, and 堕落 for personal moral failings. Having these distinctions will make your Chinese sound much more natural and precise.

How Formal Is It?

Fun Fact

The 'fǔ' in 'fǔlàn' is the same 'fǔ' found in 'dòufu' (tofu). Tofu is technically 'rotten' or 'fermented' beans, though in a delicious way!

Pronunciation Guide

UK /fuːˈlæn/

US /fuːˈlæn/

The primary stress in Mandarin is on the second syllable 'làn' due to its fourth tone intensity.

Rhymes With

半 (bàn) 饭 (fàn) 慢 (màn) 看 (kàn) 站 (zhàn) 蛋 (dàn) 叹 (tàn) 算 (suàn)

Common Errors

Pronouncing 'fǔ' as a flat first tone (fū).
Pronouncing 'làn' as 'lán' (rising second tone).
Mixing up the 'u' sound in 'fǔ' with 'ü'.
Failing to drop the pitch low enough on 'fǔ'.
Saying 'fulan' without any tones at all.

Difficulty Rating

Reading 3/5

The characters are somewhat complex but common in news and science.

Writing 4/5

The character '腐' has many strokes and requires practice.

Speaking 2/5

The tones are distinct (3rd and 4th), making it easy to say clearly.

Listening 2/5

Commonly heard in contexts of food or news.

What to Learn Next

Prerequisites

肉苹果坏变臭

Learn Next

腐败腐蚀分解细菌循环

Advanced

贪污堕落凋零枯萎

Grammar to Know

Resultative Complements

木头腐烂掉了。(The wood rotted away.)

The 'Ba' Construction

他把腐烂的苹果扔了。(He threw away the rotten apple.)

Adverbial Modifiers

食物正迅速腐烂。(Food is rotting rapidly.)

Degree Complements

肉腐烂得很严重。(The meat is rotting severely.)

Causative Verbs

潮湿使木材腐烂。(Moisture causes wood to rot.)

Examples by Level

苹果腐烂了。

The apple is rotten.

Subject + Verb + 了 (le) indicating change of state.

不要吃腐烂的水果。

Don't eat rotten fruit.

腐烂 used as an adjective with 的 (de) omitted in short phrases.

肉已经腐烂了。

The meat has already rotted.

已经 (yǐjīng) used to emphasize the state is complete.

这里有腐烂的味道。

There is a smell of rot here.

腐烂 used as an adjective modifying 味道 (wèidào).

蔬菜腐烂得很慢。

The vegetables rot very slowly.

Verb + 得 (de) + Adverb to describe the manner of rotting.

那是腐烂的叶子。

Those are rotten leaves.

Simple demonstrative sentence.

鱼腐烂了，很臭。

The fish is rotten and very stinky.

Two adjectives/states linked by a comma.

因为热，食物腐烂了。

Because it's hot, the food rotted.

Cause and effect using 因为 (yīnwèi).

如果不出售，水果会腐烂。

If not sold, the fruit will rot.

Use of 会 (huì) to indicate future possibility.

我们要清理腐烂的木头。

We need to clear away the rotten wood.

Modal verb 要 (yào) + Action.

这些花正在腐烂。

These flowers are currently rotting.

正在 (zhèngzài) indicating an ongoing process.

农民把腐烂的菜埋在土里。

The farmer buries the rotten vegetables in the soil.

把 (bǎ) construction for handling an object.

腐烂的食物会让你生病。

Rotten food will make you sick.

Causative structure: A 让 (ràng) B + Result.

这棵树的根部腐烂了。

The roots of this tree have rotted.

Possessive structure with 的 (de).

闻到腐烂的气味就要小心。

Be careful if you smell a rotting odor.

Condition (闻到...) + Result (就要...).

垃圾桶里全是腐烂的东西。

The trash can is full of rotten things.

全 (quán) meaning 'entirely' or 'full of'.

潮湿的环境加速了木材的腐烂。

The humid environment accelerated the rotting of the wood.

加速 (jiāsù) as a transitive verb affecting the process.

腐烂的过程会释放出气体。

The process of decomposition releases gases.

腐烂 treated as a noun/process.

这种真菌专门分解腐烂的物质。

This fungus specializes in decomposing rotten matter.

专门 (zhuānmén) indicating specialization.

虽然表面好看，但内部已经腐烂。

Although the surface looks good, the inside is already rotten.

Contrast using 虽然...但... (suīrán...dàn...).

防止木头腐烂的最好方法是刷漆。

The best way to prevent wood from rotting is to paint it.

防止 (fángzhǐ) + [Noun] + [Verb].

森林中腐烂的落叶是天然的肥料。

Rotten fallen leaves in the forest are natural fertilizer.

Complex noun phrase as subject.

他发现了一具已经腐烂的动物尸体。

He found an animal carcass that had already rotted.

Attributive clause describing the carcass.

如果不及时处理，伤口会腐烂。

If not treated in time, the wound will rot/become gangrenous.

Hypothetical condition with 如果 (rúguǒ).

权力的过度集中往往导致政治腐烂。

The excessive concentration of power often leads to political rot.

Abstract usage of 腐烂.

这部小说揭示了那个时代社会的腐烂。

This novel reveals the social decay of that era.

揭示 (jiēshì) meaning 'to reveal'.

这种陈旧的思想正在腐烂我们的文明。

This outdated thinking is rotting our civilization.

Metaphorical transitive-like usage.

他试图掩盖公司内部腐烂的真相。

He tried to cover up the truth of the internal rot within the company.

真相 (zhēnxiàng) meaning 'the truth'.

腐烂的官僚体系阻碍了经济发展。

A rotting bureaucratic system hindered economic development.

阻碍 (zǔ'ài) meaning 'to hinder'.

这种物质能够抑制细菌，防止腐烂。

This substance can inhibit bacteria and prevent rot.

能够 (nénggòu) indicating capability.

在这个腐烂的城市里，他感到很绝望。

In this rotting city, he felt very hopeless.

Locative phrase with 在...里.

历史的尘埃无法掩盖制度的腐烂。

The dust of history cannot hide the rot of the system.

Literary/Metaphorical style.

尸体在高温下迅速腐烂，散发出恶臭。

The body rotted rapidly under high temperatures, emitting a foul stench.

Formal descriptive style.

这种文化的腐烂并非一日之功，而是长期的积累。

The decay of this culture did not happen overnight, but was a long-term accumulation.

并非...而是... (bìngfēi...érshì...) structure.

艺术家用腐烂的意象来表达生命的脆弱。

The artist uses images of rot to express the fragility of life.

意象 (yìxiàng) meaning 'imagery'.

在沼泽地里，有机物在缺氧条件下腐烂。

In the swamp, organic matter rots under anaerobic conditions.

Scientific terminology (缺氧 - anaerobic).

他那腐烂的灵魂已经无法得到救赎。

His rotting soul can no longer be redeemed.

Religious/Philosophical context.

通货膨胀导致了社会契约的进一步腐烂。

Inflation led to the further decay of the social contract.

Social science terminology.

这些古老的建筑在岁月的侵蚀下逐渐腐烂。

These ancient buildings gradually rotted under the erosion of time.

侵蚀 (qīnshí) paired with 腐烂.

作家精准地捕捉到了那个阶级腐烂的气息。

The writer accurately captured the scent of decay of that class.

捕捉 (bǔzhuō) meaning 'to capture'.

这种宏大叙事的腐烂预示着一个旧时代的终结。

The decay of this grand narrative portends the end of an old era.

Advanced philosophical vocabulary.

在后现代语境下，‘腐烂’被赋予了审美的意义。

In the postmodern context, 'rot' has been endowed with aesthetic significance.

Passive construction with 被 (bèi).

熵增定律决定了物质世界最终走向腐烂与混沌。

The law of increasing entropy determines that the material world ultimately moves toward decay and chaos.

Scientific/Philosophical synthesis.

权力的腐烂往往包裹在华丽的辞藻之中。

The rot of power is often wrapped in ornate rhetoric.

Metaphorical use of 包裹 (bāoguǒ).

这种精神上的腐烂比肉体的消亡更为可怕。

This spiritual decay is more terrifying than the demise of the flesh.

Comparative structure with 更为 (gèngwéi).

他在废墟中寻找着文明腐烂后留下的残片。

Among the ruins, he searched for the fragments left after the decay of civilization.

Complex prepositional phrase.

通过对腐烂过程的细致观察，他悟出了生命的真谛。

Through meticulous observation of the process of decay, he realized the true meaning of life.

悟出 (wùchū) meaning 'to realize/attain enlightenment'.

这种体制性的腐烂已经渗透到了社会的每一个毛孔。

This systemic rot has permeated every pore of society.

Metaphorical use of 渗透 (shèntòu).

Common Collocations

严重腐烂

开始腐烂

腐烂的味道

防止腐烂

腐烂的木头

内部腐烂

加速腐烂

腐烂的尸体

社会腐烂

彻底腐烂

Common Phrases

腐烂变质

— A combination phrase describing food that is both rotting and gone bad.

严禁销售腐烂变质的食品。

化为腐烂

— To turn into rot; to decompose completely.

一切都会化为腐烂。

腐烂不堪

— Extremely rotten; in a state of terrible decay.

那座老房子已经腐烂不堪。

肉体腐烂

— Physical decay of the body.

肉体腐烂，但精神永存。

根部腐烂

— Root rot (common in gardening).

由于浇水过多，植物根部腐烂了。

避免腐烂

— To avoid rotting.

冷藏可以避免食物腐烂。

散发腐烂

— To emit a smell of rot.

垃圾堆散发着腐烂的气息。

腐烂过程

— The process of decomposition.

科学家正在研究腐烂过程。

由于腐烂

— Due to rotting.

由于腐烂，这根柱子断了。

防止腐烂

— To prevent rot.

我们需要采取措施防止腐烂。

Often Confused With

腐烂 vs 腐败

Mainly used for political corruption, while 腐烂 is for biological rot.

腐烂 vs 腐蚀

Used for chemical erosion or rusting of metal, not biological decay.

腐烂 vs 烂

Can mean 'rotten' but also 'mushy' or 'soft' in a positive culinary sense.

Idioms & Expressions

"陈腐不堪"

— Extremely outmoded or rotten (usually ideas).

他的思想陈腐不堪。

Literary

"推陈出新"

— To weed out the old/rotten to bring forth the new.

艺术需要推陈出新。

Formal

"流水不腐"

— Running water never goes stale/rotten (implies activity keeps things healthy).

流水不腐，户枢不蠹。

Proverb

"摧枯拉朽"

— As easy as breaking rotten wood (implies overwhelming force).

我军势如破竹，摧枯拉朽。

Formal

"朽木不可雕"

— Rotten wood cannot be carved (describes a person who is beyond help).

他真是朽木不可雕也。

Classic

"贪污腐化"

— Corruption and degeneration.

他因为贪污腐化被捕了。

Legal/News

"烂醉如泥"

— Dead drunk (using '烂' as in rotten/mushy).

他昨晚烂醉如泥。

Informal

"破烂不堪"

— Worn out and tattered (using '烂' for broken).

这件衣服破烂不堪。

Neutral

"陈辞滥调"

— Cliches (literally 'rotten/old phrases').

他的演讲全是陈辞滥调。

Literary

"化腐朽为神奇"

— To turn something rotten/useless into something miraculous.

设计师化腐朽为神奇，把废纸变成了艺术品。

Formal

Easily Confused

腐烂 vs 发霉

Both happen to old food.

发霉 is specifically about mold; 腐烂 is general decomposition.

面包发霉了，但木头腐烂了。

腐烂 vs 变质

Both mean food is bad.

变质 is about quality/safety; 腐烂 is about physical breakdown.

牛奶变质了，但香蕉腐烂了。

腐烂 vs 凋零

Both involve things dying.

凋零 is for flowers/leaves wilting; 腐烂 is the next stage of decay.

花朵凋零后开始腐烂。

腐烂 vs 枯萎

Both involve plants dying.

枯萎 is drying up; 腐烂 is breaking down with moisture.

植物因为缺水而枯萎，因为多水而腐烂。

腐烂 vs 堕落

Both used for bad people.

堕落 is a fall from grace; 腐烂 is internal moral decay.

他堕落了，灵魂也随之腐烂。

Sentence Patterns

[Noun] 腐烂了。

苹果腐烂了。

不要吃 [Adjective] 的 [Noun]。

不要吃腐烂的菜。

[Cause] 导致了 [Noun] 的腐烂。

细菌导致了肉的腐烂。

[Abstract Noun] 正在腐烂。

这个制度正在腐烂。

[Noun] 在 [Condition] 下腐烂。

尸体在高温下腐烂。

散发着...腐烂的气息

房间里散发着腐烂的气息。

[Noun] 的腐烂预示着...

文明的腐烂预示着变革。

化腐朽为神奇

他通过艺术化腐朽为神奇。

Word Family

Nouns

腐败 (corruption)

腐朽 (decay/decadence)

腐殖质 (humus)

Verbs

腐蚀 (to corrode)

腐化 (to degenerate)

Adjectives

腐旧 (old and rotten)

烂 (rotten/soft)

细菌 (bacteria)

分解 (decompose)

臭 (stinky)

垃圾 (trash)

变质 (spoil)

How to Use It

frequency

Common in news, science, and descriptive literature.

Common Mistakes

Using 腐烂 for sour milk. → 牛奶变质了。
Milk doesn't physically rot into pieces; it changes chemically.
Saying 'The water rotted the wood' as '水腐烂了木头'。 → 水使木头腐烂了。
腐烂 is usually intransitive. You need a causative verb like '使' (shǐ).
Confusing 腐烂 with 腐蚀 for metal. → 铁生锈了 / 铁被腐蚀了。
Metal doesn't 'rot' (biological); it 'corrodes' (chemical).
Using 腐烂 to mean 'tender' meat. → 肉炖得很烂。
While '烂' can mean tender, '腐烂' always means rotten and inedible.
Writing '腐' without the 'meat' radical. → 腐 (bottom is 肉/月).
The radical is essential for the meaning of 'spoiled meat'.

Tips

Context Matters

Always check if you are describing a physical object or a system. Use '腐烂' for both, but remember the metaphorical use is more formal.

Tone Accuracy

The third tone in 'fǔ' is low. If you say it too high, it might sound like 'fú' (floating).

Synonym Choice

Use '变质' for food safety warnings. Use '腐烂' for describing the gross physical state.

Character Practice

The 'meat' radical (肉) inside '腐' is often written as '月' in modern scripts. Don't be confused!

Particle Use

Pair '腐烂' with '了' to show that the process has already happened or is starting.

Political Nuance

When reading Chinese news, '腐' almost always refers to corruption. '反腐' is a key keyword.

Eco-Friendly

In composting contexts, '腐烂' is a good thing! It's how we get fertilizer.

Smell Association

Associate '腐烂' with the word '臭' (chòu - stinky) to remember its negative physical meaning.

vs. 坏了

If you are at a friend's house, say '坏了'. If you are writing a report, use '腐烂'.

Learn the Proverb

Remember '流水不腐' (Running water doesn't rot) to encourage yourself to stay active in your studies!

Memorize It

Mnemonic

Think of a 'Storehouse' (府) full of 'Meat' (肉) that has been left too long. It starts to 'fǔ' (rot). Then imagine a 'Fire' (火) that has cooked something until it is 'làn' (mushy). Together, they are 'fǔlàn'—totally rotten!

Visual Association

Visualize an old wooden bridge in a swamp. The wood is dark, wet, and falling apart in chunks. That is '腐烂'.

Word Web

Food Smell Bacteria Old Soft Compost Corruption Death

Challenge

Try to find three things in your kitchen that are '变质' (bad) but not yet '腐烂' (rotting). Then, find something in nature that is '腐烂' and describe it.

Word Origin

The character '腐' (fǔ) combines '府' (fǔ - government office/storehouse) and '肉' (ròu - meat). It originally described meat that had gone bad in storage. '烂' (làn) combines '火' (huǒ - fire) and '兰' (lán - phonetic). It originally meant overcooked or soft, later extending to rotten.

Original meaning: Spoiled meat that has become soft and foul-smelling.

Sino-Tibetan (Mandarin Chinese).

Cultural Context

Be careful when using this word to describe people; it is an extreme insult, implying they are sub-human or completely depraved.

In English, 'rotten' can be used for a 'rotten person' (mean). In Chinese, '腐烂的人' is rarely used for a mean person; it's used for someone who is morally depraved or a literal zombie.

反腐倡廉 (Anti-corruption campaign) 豆腐 (Tofu - the 'good' rot) 《葬花吟》 (Poem about burying rotting flowers)

Practice in Real Life

Real-World Contexts

In the Kitchen

肉腐烂了
闻到臭味
扔进垃圾桶
变质的食物

In Nature

落叶腐烂
树木分解
泥土的味道
自然循环

In Politics

腐败现象
体制腐烂
打击贪污
社会问题

In Medicine

伤口腐烂
细菌感染
防止发炎
严重受损

In Literature

腐烂的灵魂
时代的终结
荒凉的废墟
死亡的气息

Conversation Starters

"你觉得现在的社会有什么腐烂的地方吗？ (Do you think there's any rot in today's society?)"

"如果冰箱坏了，里面的食物多久会腐烂？ (If the fridge breaks, how long until the food inside rots?)"

"你闻过最难闻的腐烂味道是什么？ (What's the worst smell of rot you've ever smelled?)"

"在你的国家，人们怎么处理腐烂的垃圾？ (In your country, how do people handle rotting trash?)"

"你认为‘流水不腐’这个成语有道理吗？ (Do you think the idiom 'running water never rots' makes sense?)"

Journal Prompts

描写一个你见过的废弃建筑，用上‘腐烂’这个词。 (Describe an abandoned building you've seen, using the word 'fǔlàn'.)

讨论一下为什么有些食物腐烂得快，有些腐烂得慢。 (Discuss why some foods rot quickly and others slowly.)

写一段关于自然界循环的文字，提到落叶的腐烂。 (Write a passage about the cycle of nature, mentioning the rotting of fallen leaves.)

你认为一个人的道德是如何开始腐烂的？ (How do you think a person's morals begin to rot?)

想象一个没有腐烂的世界会是什么样子。 (Imagine what a world without decomposition would look like.)

Frequently Asked Questions

10 questions

Usually no. Milk doesn't 'rot' in the sense of breaking down into pieces; it sours or curdles. Use '变质' or '酸了' instead.

In biology, it's neutral. When describing people or society, it is very negative and insulting.

腐烂 is the formal two-syllable word. 烂 is one syllable and can be used casually, but it also has other meanings like 'soft' or 'broken'.

Yes, it can mean 'decay' or 'decomposition' in a formal or scientific sentence.

It is '根腐病' or '根部腐烂'.

No, tofu is '发酵' (fermented). Although the character '腐' is there, we don't say tofu is '腐烂' because it's still good to eat.

Yes, '腐烂的味道' (the smell of rot) is a very common phrase.

No, for rust use '生锈' (shēngxiù). For chemical eating away of metal, use '腐蚀' (fǔshí).

If they are made of leather or wood and are literally decomposing from moisture, yes. If they are just broken, use '破了'.

Only in ecology, when describing how nutrients are recycled back into the earth.