This page in your language

فارسی

العربية

Deutsch

Español

Français

日本語

한국어

Português

中文

हिन्दी

B1 noun/verb #4,000 most common 11 min read

索引

suoyin Top 4,000

Practice it Examples Notes & Tips 索引 in 30 Seconds

Explanation 索引 in your Level:

At the A1 level, '索引' (suǒyǐn) is a very advanced word that you likely won't need for daily survival. However, you can think of it simply as a 'special list' at the back of a book. Imagine you have a book about animals. At the end, there is a list: 'Cat... page 5, Dog... page 10'. That list is an 索引. At this level, you only need to know that it helps you find things. It is different from '目录' (mùlù), which is the list at the beginning of the book showing the chapters. You might see this word in a library or when looking at a textbook. Just remember: 索引 = Index. It is a tool for finding information quickly. You don't need to worry about the grammar yet, just recognize the characters if you see them in a book.

At the A2 level, you are starting to use more specific nouns for school and work. '索引' (suǒyǐn) is useful when you are talking about studying. You can use it in simple sentences like '这本书有索引吗？' (Does this book have an index?). It's a noun that describes a list of keywords. You might also start to see it in digital contexts, like on a website's help page. The character '索' (suǒ) means to search or ask, and '引' (yǐn) means to lead or guide. So, it's a 'search guide'. At this stage, try to remember that it's usually at the end of a book. If you are learning how to use a library, this word will be very helpful. It's a formal word, so using it makes you sound more like a serious student.

At the B1 level, you should be able to use '索引' (suǒyǐn) in more complex sentences and understand its role as both a noun and a verb. You are likely reading longer texts, and knowing how to '查索引' (check the index) is a practical skill. You should also be aware of its use in technology, such as '搜索引擎' (search engines) like Google or Baidu, which '索引' (index) the internet. You can use it to describe your study habits: '我通过索引找到了我需要的资料' (I found the materials I needed through the index). You should also distinguish it clearly from '目录' (Table of Contents). In a professional setting, if you are asked to organize files, you might '建立一个索引' (establish an index) to help others find things. This shows you are moving beyond basic vocabulary into functional, professional Chinese.

At the B2 level, '索引' (suǒyǐn) becomes a key term for academic and technical discussions. You should understand specific compounds like '主题索引' (subject index) and '关键词索引' (keyword index). You will encounter this word in discussions about database management and information science. For example, '给数据库添加索引可以显著提高查询速度' (Adding an index to a database can significantly improve query speed). You should be able to use the word as a verb naturally, such as '系统正在对文件进行索引' (The system is indexing the files). At this level, you are expected to understand the nuance that '索引' implies a systematic, often alphabetical or coded, reference system. It is not just a simple list (列表), but a structured tool for efficiency. You might also see it in legal or medical contexts referring to case or patient files.

At the C1 level, you are expected to have a deep understanding of '索引' (suǒyǐn) in specialized fields. In literature and history, you might study '引得' (the old term for index) or the history of Chinese concordance making. In computer science, you'll discuss '倒排索引' (inverted index), which is the basis for modern search engines. You should be able to use the word metaphorically or in highly formal reports. For instance, '这篇文章的索引非常详尽，具有很高的学术价值' (The index of this article is very exhaustive and has high academic value). You should also understand the cultural significance of indexing in the digital transformation of Chinese ancient texts. Your usage should be precise, distinguishing between '索引' (the structure), '检索' (the retrieval process), and '标引' (the act of assigning index terms).

At the C2 level, you master '索引' (suǒyǐn) in its most abstract and technical forms. You can participate in high-level debates about '索引算法' (indexing algorithms) or the ethics of information '索引' in big data and AI. You understand the philological history of how Chinese scholars organized knowledge before Western indexing methods were introduced. You can write professional documentation or academic papers that utilize '索引' as a fundamental concept in data architecture or library science. You might use it in complex metaphorical senses, like '索引一个时代的精神' (indexing the spirit of an era), though this is rare and highly literary. At this level, the word is not just a vocabulary item but a conceptual tool that you use to discuss the structure of knowledge itself in both the Chinese-speaking world and global contexts.

Practice it Examples Notes & Tips

索引 in 30 Seconds

A systematic reference list (index) used to locate specific information within a document or a database efficiently.
Functions as both a noun (the list itself) and a verb (the act of creating the list or indexing data).
Essential in academic writing, library science, and computer database optimization to speed up information retrieval.
Commonly confused with 'Table of Contents' (目录), but usually located at the end and organized alphabetically.

The Chinese term 索引 (suǒyǐn) is a sophisticated word that functions as both a noun and a verb, deeply rooted in the organization of information. At its core, it refers to an index—that systematic list of terms, names, or subjects found at the end of a book or within a database that points you to specific locations. In the digital age, its importance has exploded, moving from the dusty shelves of libraries to the backbone of search engine technology and database management.

The Noun Form: In a physical context, it is the 'Index' page. For example, '书后的索引' (the index at the back of the book). In a digital context, it refers to the data structure that improves the speed of data retrieval operations.
The Verb Form: It means 'to index' or 'to categorize for retrieval'. When a librarian organizes new arrivals or a Google bot crawls a website, they are performing the action of 索引.

如果你找不到那个章节，请查看书末的索引。 (If you cannot find that chapter, please check the index at the end of the book.)

People use this word most frequently in academic, technical, and professional settings. If you are a student writing a thesis, you will need to create an 索引. If you are a software engineer working with SQL databases, you are constantly 'creating indices' (创建索引) to optimize performance. Unlike the word 目录 (mùlù), which refers to a Table of Contents (the chronological order of chapters), 索引 is specifically for alphabetical or thematic lookups. This distinction is crucial for learners to grasp.

搜索引擎通过索引网页来提供快速的搜索结果。 (Search engines provide fast search results by indexing web pages.)

In modern Mandarin, you might also hear it in the context of 'Citation Indices' like the SCI (Science Citation Index), which is translated as 科学引文索引. Here, it takes on a highly prestigious academic connotation. When discussing big data, you will encounter 'Full-text indexing' (全文索引), a key concept in information retrieval. Even in daily life, if someone is very organized, you might metaphorically say they have an 'index in their brain' for where everything is kept, though this is more of a creative usage.

我们需要为这本厚厚的法律汇编编制一套详细的索引。 (We need to compile a detailed index for this thick legal compendium.)

Evolution of Use: Traditionally, it was a tool for scholars. Now, it is a tool for machines. The shift from physical index cards in a library card catalog to automated algorithmic indexing is reflected in how the word is paired with verbs like '自动' (automatic) and '实时' (real-time).

没有索引，在海量数据中找信息就像大海捞针。 (Without an index, finding information in massive data is like looking for a needle in a haystack.)

Using 索引 correctly involves understanding its role as a functional component of a document or a database. It usually appears as the object of verbs like 查 (search), 建立 (establish/build), 编制 (compile), or 修复 (repair). Because it is a formal word, the sentences surrounding it often carry a professional or instructional tone. Let's look at how to integrate it into various grammatical structures.

As a Subject: 索引通常按字母顺序排列。 (The index is usually arranged in alphabetical order.) Here, the index is the focus of the description.

这份索引不够完整，漏掉了很多关键词。 (This index is not complete enough; it missed many keywords.)

When used as a verb, it often describes the process of a system or a person processing data. In technical Chinese, we often see the pattern '对...进行索引' (to perform indexing on...). This is a common way to turn a noun into a formal action. For example, '对数据库进行索引' (to index the database).

系统正在自动索引新上传的文件。 (The system is automatically indexing the newly uploaded files.)

In academic writing, you will frequently see compound nouns. 主题索引 (Subject index), 作者索引 (Author index), and 关键词索引 (Keyword index) are the most common. Using these specific terms makes your Chinese sound much more native and precise. If you are describing a book that lacks this feature, you would say '这本书没有索引' (This book doesn't have an index), which sounds like a critique of its usability.

为了方便读者，作者在书后增加了详细的索引。 (To facilitate readers, the author added a detailed index at the back of the book.)

Common Verb Pairings: 1. 查阅 (cháyuè) - To consult the index.
2. 更新 (gēngxīn) - To update the index.
3. 优化 (yōuhuà) - To optimize the index (technical).

如果你想提高查询速度，你应该给这个字段加上索引。 (If you want to improve query speed, you should add an index to this field.)

Finally, consider the negative form. '未被索引' (not indexed) is a common phrase in SEO (Search Engine Optimization) when a website doesn't show up on Google. '由于技术故障，这些页面尚未被索引。' (Due to technical glitches, these pages have not yet been indexed.) This demonstrates the word's versatility across different levels of formality and modern technology.

While 索引 might not be a word you use to buy vegetables at the market, it is omnipresent in the 'Information Society'. You will encounter it in specific environments where data is organized. Understanding these contexts will help you recognize the word when it's spoken or written in real-world scenarios.

1. Libraries and Archives: Librarians are the primary users of this word. You might hear: '请使用我们的电子索引来查找图书。' (Please use our electronic index to find books.) In this context, it refers to the catalog system.
2. Academic and Research Institutions: Researchers talk about 'Citation Indices'. A common question among PhD students is: '这篇文章被哪些索引收录了？' (Which indices have included this article?) This refers to prestigious databases like Scopus or Web of Science.

图书馆的卡片索引已经被数字化系统取代了。 (The library's card index has been replaced by a digital system.)

The tech industry is perhaps the largest modern consumer of the term. If you work in IT in China, '索引' is a daily word. Database administrators (DBAs) discuss 'Index fragmentation' (索引碎片) and 'Clustered indices' (聚集索引). In a meeting, a developer might say: '我们的查询太慢了，需要优化索引。' (Our queries are too slow; we need to optimize the index.) This is a high-frequency usage in the Beijing or Shenzhen tech hubs.

百度还没有索引我的新博客。 (Baidu hasn't indexed my new blog yet.)

You also find this word in the legal and medical professions. Large case files or medical records require a 'Patient index' (患者索引) or 'Case index' (案例索引). In a courtroom, a lawyer might refer to a specific 'Index of evidence' (证据索引). It implies a level of meticulousness and systematic organization that 'list' (列表) or 'table' (表) does not convey.

这份年度报告的末尾附有详细的财务术语索引。 (The end of this annual report includes a detailed index of financial terms.)

3. Publishing and Editing: Editors use it when discussing book layouts. '索引编制' (Index preparation) is a specific stage in the publishing workflow. You might hear an editor say: '索引的页码需要重新核对。' (The page numbers in the index need to be re-checked.)

In summary, wherever there is a need to find a needle in a digital or paper haystack, you will hear 索引. It is the language of organization, efficiency, and professional documentation. If you are reading a high-level textbook or using a professional software interface in Chinese, keep an eye out for these two characters.

Even though 索引 is a relatively straightforward term, learners often confuse it with other 'list-like' words in Chinese. Understanding the boundaries of this word will prevent you from sounding unnatural or being misunderstood. Here are the most common pitfalls.

Confusion with 目录 (mùlù): This is the #1 mistake. 目录 is a Table of Contents. It follows the order of the book (Chapter 1, Chapter 2...). 索引 is an Index. It is usually alphabetical and found at the back. Don't say '我要看书前面的索引' (I want to see the index at the front of the book)—that's almost always a 目录.

错误：请看书前面的索引找到第一章。 (Wrong: Please look at the index at the front to find Chapter 1.)
正确：请看书前面的目录找到第一章。

Another mistake is using 索引 when you simply mean a 'list' (列表 - lièbiǎo). A shopping list is a 列表, not an 索引. An index implies a reference system. If the list doesn't point to a page number, a line of code, or a specific location, it's probably not an 索引. Using 索引 for a simple list of items makes you sound overly academic or technical in a way that feels out of place.

错误：这是我的购物索引。 (Wrong: This is my shopping index.)
正确：这是我的购物清单 (qīngdān - list/invoice).

Learners also struggle with the verb usage. In English, we 'index a book'. In Chinese, you can say '索引一本书', but it's more common and natural to say '为一本书编制索引' (compile an index for a book). Using 索引 alone as a verb is more common in technical computer science contexts ('索引网页') than in general literature contexts. Overusing it as a simple verb can sometimes sound like a direct translation from English (Chinglish).

Confusion with 检索 (jiǎnsuǒ): 检索 means 'to search/retrieve' (the process of looking something up). 索引 is the tool or the list used to do it. You 检索 information using an 索引. You don't '索引' information when you mean you are searching for it.

错误：我在索引这个单词。 (Wrong: I am indexing this word [meaning searching for it].)
正确：我在检索这个单词。

Finally, be careful with the pronunciation. Both characters are third tone (suǒ yǐn). Beginners often drop the tone on the second character, making it sound like 'suǒ yin' (neutral tone), which can make the word harder to recognize in a fast conversation. Practice the 'dip and rise' of the third tone for both syllables to sound clear and professional.

To truly master 索引, you must understand its 'neighbors'—words that share similar meanings but are used in different contexts. Chinese is a language of precision, and choosing the right word for 'list' or 'search' depends entirely on the situation.

索引 vs. 目录 (mùlù): 索引: Alphabetical/Thematic list at the back. Purpose: Specific lookup.
目录: Sequential list at the front. Purpose: Overview of structure.
索引 vs. 检索 (jiǎnsuǒ): 索引: The noun (the index itself) or the act of creating it.
检索: The verb of searching through a database or index to find something. 检索 is the action of the user; 索引 is the tool provided.

通过高效的索引，我们可以快速检索到所需信息。 (Through an efficient index, we can quickly retrieve the required information.)

Other alternatives include 列表 (lièbiǎo), which is a general term for any list. If you are making a list of names for a party, use 列表. If you are making a list of terms found in a book with their page numbers, use 索引. Then there is 清单 (qīngdān), which usually refers to a detailed list of items like an invoice, a checklist, or a manifest. You wouldn't call a book index a '清单'.

请根据这份清单核对货物，然后查看索引找到说明书的相关部分。 (Please check the goods according to this list [清单], then check the index [索引] to find the relevant part of the manual.)

In more formal or classical contexts, you might see 引得 (yǐndé). This was a phonetic transliteration of the English word 'index' used in the early 20th century in China. While it is rarely used now, you might see it in old academic journals or libraries. Modern speakers have almost entirely reverted to the native 索引.

Quick Comparison Table: - 索引: Index (Functional/Reference)
- 目录: TOC (Structural/Overview)
- 列表: List (General/Simple)
- 清单: Detailed List (Inventory/Checklist)
- 检索: Search/Retrieve (Action)

By distinguishing these terms, you demonstrate a high level of Chinese proficiency. Using 索引 correctly shows you understand not just the word, but the system of information management it represents. This is especially important in HSK 5 and 6 levels, where precision in formal vocabulary is tested.

How Formal Is It?

Fun Fact

The modern use of '索引' as a translation for the Western concept of an 'Index' gained popularity in the early 20th century. Before that, Chinese books used different systems of classification, though 'Leishu' served a similar purpose.

Pronunciation Guide

UK /sʊɔ̌ ìn/

US /swɔ̌ ìn/

Both syllables carry equal weight, but the tone sandhi makes the first syllable slightly more dynamic.

Rhymes With

火 (huǒ) 锁 (suǒ) 果 (guǒ) 引 (yǐn) 品 (pǐn) 近 (jìn) 信 (xìn) 心 (xīn)

Common Errors

Pronouncing 'suo' as 'suō' (1st tone).
Pronouncing 'yin' as 'yīn' (1st tone).
Confusing 'suo' with 'shuo' (adding an 'h' sound).
Failing to perform tone sandhi, making the word sound choppy.
Pronouncing 'yin' as 'ying' (adding a nasal 'g').

Difficulty Rating

Reading 3/5

The characters are somewhat complex but common in academic materials.

Writing 4/5

Writing '索' requires attention to stroke order and the middle components.

Speaking 2/5

Pronunciation is easy, but tone sandhi (3-3 to 2-3) is important.

Listening 3/5

Can be confused with '所以' in fast speech if not listening for the 'n' ending.

What to Learn Next

Prerequisites

目录搜索查找列表信息

Learn Next

检索数据库关键词参考文献摘要

Advanced

倒排索引哈希算法文献计量学元数据标引语言

Grammar to Know

Tone Sandhi (3-3 rule)

索引 (suǒ yǐn) becomes (suó yǐn).

Using '对...进行' for formal actions

对数据库进行索引。

The use of '为' to indicate benefit

为这本书编制索引。

Measure words for documents

一份详细的索引。

Resultative complements

索引编制好了。

Examples by Level

书后面有索引。

There is an index at the back of the book.

Simple 'Noun + Location + 有 + Noun' structure.

索引很有用。

The index is very useful.

Subject + Adjective phrase.

请看索引。

Please look at the index.

Polite imperative using '请'.

索引在第200页。

The index is on page 200.

Subject + 在 + Location.

我不懂这个索引。

I don't understand this index.

Negative sentence with '不'.

这是一个好索引。

This is a good index.

Using '是' and the measure word '个'.

你会查索引吗？

Can you check the index?

Question with '吗'.

索引帮我找书。

The index helps me find (things in) the book.

Subject + Verb + Object.

我正在查阅书后的索引。

I am currently consulting the index at the back of the book.

Using '正在' for continuous action.

这个索引按字母顺序排列。

This index is arranged in alphabetical order.

Using '按...排列' (arranged according to...).

如果你迷路了，就看索引。

If you are lost (in the book), just look at the index.

Conditional '如果...就...' structure.

图书馆有电子索引。

The library has an electronic index.

Compound noun '电子索引'.

这本词典的索引非常详细。

The index of this dictionary is very detailed.

Adjective phrase with '非常'.

我需要给我的笔记做个索引。

I need to make an index for my notes.

Using '给...做' (make ... for ...).

索引里没有这个名字。

This name is not in the index.

Location '索引里' + '没有'.

请把索引打印出来。

Please print out the index.

Ba-sentence '把...打印出来'.

为了提高效率，我们需要建立一个索引。

In order to improve efficiency, we need to establish an index.

Purpose clause '为了...'.

搜索引擎会自动索引互联网上的网页。

Search engines automatically index web pages on the internet.

Adverb '自动' modifying the verb '索引'.

如果没有索引，找信息会很慢。

If there is no index, finding information will be very slow.

Conditional '如果没有...会...'.

你可以通过索引找到相关的章节。

You can find relevant chapters through the index.

Using '通过' (through/by means of).

这份报告缺少索引，阅读起来不方便。

This report lacks an index, making it inconvenient to read.

Resultative structure '...起来...'.

索引编制是一项细致的工作。

Index compilation is a meticulous task.

Noun phrase '索引编制' as subject.

他正在学习如何对数据库进行索引。

He is learning how to index a database.

Using '对...进行' to nominalize the action.

所有的关键词都已经包含在索引中了。

All keywords have already been included in the index.

Passive-like structure with '包含在...中'.

给经常查询的字段建立索引可以优化性能。

Establishing an index for frequently queried fields can optimize performance.

Complex subject clause.

该学术期刊被多个国际知名索引收录。

This academic journal is indexed by several internationally renowned indices.

Passive voice using '被'.

索引碎片过多会导致系统运行缓慢。

Too much index fragmentation will cause the system to run slowly.

Cause and effect relationship.

我们需要重新编制这本法律汇编的索引。

We need to re-compile the index for this legal compendium.

Using '重新' (again/anew).

全文索引技术极大地提高了搜索的准确性。

Full-text indexing technology has greatly improved search accuracy.

Resultative '提高了...准确性'.

在没有索引的情况下，数据库必须进行全表扫描。

In the absence of an index, the database must perform a full table scan.

Fixed expression '在...的情况下'.

索引不仅包含页码，还包含相关的子条目。

The index contains not only page numbers but also relevant sub-entries.

Conjunction '不仅...还...'.

为了保证数据的实时性，索引需要定期更新。

To ensure the real-time nature of data, the index needs to be updated regularly.

Purpose clause + necessity '需要'.

该软件利用倒排索引算法实现了秒级搜索。

The software achieves sub-second searching by utilizing an inverted index algorithm.

Technical term '倒排索引' (inverted index).

索引的深度和广度直接影响到信息检索的质量。

The depth and breadth of the index directly affect the quality of information retrieval.

Abstract nouns '深度' and '广度' as subjects.

古代文献的索引工作对于汉学研究至关重要。

The indexing of ancient documents is crucial for Sinology research.

Formal adjective '至关重要' (vital/crucial).

编译器在处理大型项目时会生成符号索引。

The compiler generates a symbol index when processing large projects.

Temporal clause '在...时'.

我们应当审慎评估索引策略对存储空间的影响。

We should carefully evaluate the impact of indexing strategies on storage space.

Formal verb '审慎评估' (carefully evaluate).

通过建立多维索引，系统可以处理复杂的空间查询。

By establishing multi-dimensional indices, the system can handle complex spatial queries.

Using '通过...可以...'.

索引编制过程中的主观性可能导致查准率下降。

Subjectivity during the indexing process may lead to a decrease in precision.

Abstract noun '主观性' (subjectivity).

引文索引分析揭示了该学术领域的发展脉络。

Citation index analysis reveals the development trajectory of this academic field.

Formal verb '揭示' (reveal).

在大数据环境下，分布式索引架构成为了解决扩展性难题的关键。

In a big data environment, distributed indexing architecture has become the key to solving scalability challenges.

Complex noun phrase '分布式索引架构'.

这种新型索引机制巧妙地权衡了查询速度与更新开销。

This new indexing mechanism cleverly balances query speed and update overhead.

Formal verb '权衡' (balance/weigh).

索引不仅是检索的工具，更是知识体系结构化的一种体现。

An index is not just a tool for retrieval, but an embodiment of the structuring of a knowledge system.

Philosophical '不仅是...更是...' structure.

由于索引失效，系统在极端负载下出现了崩溃。

Due to index failure, the system crashed under extreme load.

Causal '由于...'.

该论文深入探讨了语义索引在自然语言处理中的应用前景。

The paper explores in depth the application prospects of semantic indexing in natural language processing.

Formal verb '探讨' (explore/discuss).

索引的自动化生成依赖于高度精准的实体识别技术。

The automated generation of indices relies on highly accurate entity recognition technology.

Verb '依赖于' (relies on).

通过对历史档案进行数字化索引，我们得以窥见古人的日常生活。

By digitally indexing historical archives, we are able to catch a glimpse of the daily lives of ancestors.

Formal structure '得以' (be able to/achieve).

在构建知识图谱时，索引的设计必须兼顾灵活性与检索效率。

When building a knowledge graph, the index design must balance flexibility and retrieval efficiency.

Formal verb '兼顾' (give consideration to both).

Synonyms

目录检索名录清单导引

Antonyms

正文内容

Common Collocations

建立索引

查阅索引

全文索引

主题索引

自动索引

字母索引

关键词索引

引文索引

索引碎片

倒排索引

Common Phrases

索引页

— The specific page where the index is located. It is the physical location in a book.

请翻到书末的索引页。

索引号

— A specific reference number used in an index, often used in libraries or file systems.

请记录下这本书的索引号。

电子索引

— An index stored in digital format, such as a searchable database or PDF index.

你可以使用电子索引来搜索。

编纂索引

— The formal act of compiling or editing a complex index for a large work.

他花费了三年时间编纂这部百科全书的索引。

失去索引

— When a file or database entry can no longer be found because its index is broken.

文件因为失去索引而无法访问。

索引目录

— Sometimes used to refer to a structured list that acts as both a directory and an index.

查看索引目录以获取更多信息。

建立全文索引

— The process of indexing every word in a set of documents.

我们需要为这些文档建立全文索引。

索引搜索

— Searching specifically through an index rather than the whole text.

索引搜索比普通搜索更快。

作者索引

— A list of authors mentioned in a book with their corresponding page numbers.

请在作者索引中查找这位教授。

分类索引

— An index organized by categories rather than alphabetically.

这本手册提供了一个分类索引。

Often Confused With

索引 vs 所以 (suǒyǐ)

Sounds similar but means 'therefore'. Beginners often mix them up.

索引 vs 目录 (mùlù)

Refers to Table of Contents, not an alphabetical index.

索引 vs 检索 (jiǎnsuǒ)

The act of searching, whereas '索引' is the tool used for searching.

Idioms & Expressions

"顺藤摸瓜"

— Literally: Follow the vine to find the melon. Metaphorically, it means to follow clues to find the truth, similar to how one uses an index.

通过索引，我们可以顺藤摸瓜找到所有相关章节。

Common Idiom

"一目了然"

— Obvious at a glance. A good index makes the structure of a book '一目了然'.

有了这个索引，全书的重点一目了然。

Common Idiom

"大海捞针"

— To fish for a needle in the ocean. Searching without an index is like '大海捞针'.

没有索引，在这么多资料中找信息无异于大海捞针。

Common Idiom

"按图索骥"

— To look for a steed according to a picture. Following a guide or index strictly to find something.

他按图索骥，很快就从索引里找到了那个术语。

Literary Idiom

"了如指掌"

— To know something like the palm of one's hand. An index helps a reader become '了如指掌' with a book.

他对这个领域的文献索引了如指掌。

Common Idiom

"条理清晰"

— Well-organized and clear. Used to describe a well-made index.

这份索引编制得条理清晰。

Formal

"事半功倍"

— Half the effort, twice the result. Using an index is '事半功倍'.

学会利用索引，查资料就能事半功倍。

Common Idiom

"博古通今"

— To have wide knowledge of both ancient and modern things. Often used for scholars who master indices.

这位老学者博古通今，几乎不需要查索引。

Literary Idiom

"开卷有益"

— Opening a book is always beneficial. An index encourages '开卷有益' by making info accessible.

即使只是翻翻索引，也能开卷有益。

Common Idiom

"精益求精"

— To constantly strive for perfection. Used for the meticulous process of indexing.

编制索引需要精益求精的精神。

Common Idiom

Easily Confused

索引 vs 目录

Both are lists found in books.

目录 is at the front and chronological; 索引 is at the back and alphabetical.

看目录找章节，看索引找单词。

索引 vs 检索

Both relate to searching for info.

索引 is the noun/structure; 检索 is the verb/process.

我在数据库里检索信息，因为我有索引。

索引 vs 列表

Both are lists.

列表 is generic; 索引 implies a reference to a location (like a page).

这是一份名单列表，不是索引。

索引 vs 清单

Both are detailed lists.

清单 is for items/inventory; 索引 is for content/lookup.

购物清单里没有页码，所以它不是索引。

索引 vs 编目

Both are library terms.

编目 is cataloging a whole book; 索引 is cataloging the content within a book.

图书馆员正在编目新书，并为其中的重要内容做索引。

Sentence Patterns

这是[Noun]的索引。

这是这本书的索引。

请看[Location]的索引。

请看书末的索引。

通过索引，我们可以[Action]。

通过索引，我们可以快速找到关键词。

我们需要为[Object]建立索引。

我们需要为这些文件建立索引。

给[Field]加索引可以[Result]。

给这个字段加索引可以提高查询速度。

[Subject]被收录在[Index Name]中。

他的论文被收录在科学引文索引中。

[Action]直接影响到索引的[Attribute]。

数据结构直接影响到索引的效率。

在[Context]下，索引的设计必须兼顾[A]与[B]。

在海量数据环境下，索引的设计必须兼顾灵活性与检索效率。

Word Family

Nouns

索引员 (Indexer)

索引表 (Index table)

索引号 (Index number)

Verbs

索引 (To index)

标引 (To tag/index terms)

Adjectives

索引式的 (Index-like)

索引化的 (Indexed)

目录 (Table of Contents)

文献 (Literature)

检索 (Retrieval)

数据库 (Database)

关键词 (Keyword)

How to Use It

frequency

Common in academic and technical fields; rare in casual daily conversation.

Common Mistakes

Using 索引 for Table of Contents. → 使用目录 (mùlù).
索引 is for alphabetical lookups at the back; 目录 is for chapter order at the front.
Saying '我索引这个词' to mean 'I'm looking up this word'. → 我在查 (chá) 这个词 or 检索 (jiǎnsuǒ).
索引 is the list; you search 'in' the index, you don't 'index' a word you are looking for.
Using 索引 for a shopping list. → 使用清单 (qīngdān).
索引 implies a reference system with pointers/page numbers. A simple list is not an index.
Pronouncing it as 'suǒ yǐ'. → suǒ yǐn.
The 'n' at the end of 'yin' is critical. Without it, it sounds like 'therefore'.
Writing '索' with the wrong bottom part. → The bottom is '糸' (silk), not '木' (wood).
The character '索' relates to rope/silk, so the radical is important.

Tips

Don't mix with 目录

Always remember: 目录 (front/chapters), 索引 (back/keywords). Mixing them is a common beginner mistake.

Third Tone Pair

Both characters are 3rd tone. Remember the tone sandhi: the first syllable 'suo' sounds like a 2nd tone.

Database Context

If you are in IT, use '建立索引' for 'creating an index' in SQL. It's the standard industry term.

Citation Indices

When talking about SCI or EI papers, always use '索引' to refer to the databases they are in.

Formal Verbs

Pair '索引' with '编制' (biānzhì - compile) to sound like a native professional or academic.

The Search Rope

Visualize '索' as a rope. You are pulling a rope to find the right information. '引' is the guide leading you.

Look for the characters

In a Chinese textbook, flip to the very end. You will see '索引' written in large characters.

Context is King

If someone says 'suo yi...', check if they follow with a result (therefore) or a location (index).

Web Indexing

Use '索引' when talking about whether Google has found your blog post yet.

Precise Lists

Only use '索引' if the list points to something else. If it's just a list of names, use '列表'.

Memorize It

Mnemonic

Think of a 'Rope' (索) that 'Leads' (引) you to the information. You pull the rope of the index to find the treasure in the book.

Visual Association

Imagine a library where every book has a long string (rope) coming out of the back, leading directly to the specific shelf where the info is kept.

Word Web

Book Database Search Page number Keyword Library Organization Speed

Challenge

Write three sentences: one about a book index, one about a search engine indexing a site, and one about a database index.

Word Origin

The word is composed of 索 (suǒ), meaning 'rope' or 'to search/demand', and 引 (yǐn), meaning 'to pull', 'to lead', or 'to cite'. In ancient times, '索' referred to cords used for binding or searching for something hidden.

Original meaning: Originally, it meant to search for and extract the essence or main points of a text.

Sino-Tibetan (Chinese).

Cultural Context

No major sensitivities; it is a neutral, professional term.

In English-speaking countries, an index is a standard part of any non-fiction book. In China, this was not always the case for traditional woodblock prints, which relied more on 'mulu' (TOC).

SCI (Science Citation Index) - 科学引文索引 EI (Engineering Index) - 工程索引 Google Search Console - 谷歌搜索索引

Practice in Real Life

Real-World Contexts

Library Research

查阅书目索引
使用电子索引
索引卡片
按作者索引

Computer Programming

创建数据库索引
索引优化
唯一索引
索引覆盖

Academic Writing

编制关键词索引
引文索引分析
主题索引表
索引编制规范

Web Development (SEO)

网页被索引
禁止索引
索引频率
搜索引擎索引

Legal Documentation

证据索引
案例索引
法规索引
卷宗索引

Conversation Starters

"你觉得书后的索引对你学习有帮助吗？"

"你在做数据库开发时，通常会给哪些字段加索引？"

"为什么有些书没有索引，你觉得这是个问题吗？"

"你知道除了字母顺序，索引还可以怎么排列吗？"

"当你在网上搜不到你的网页时，你会检查索引设置吗？"

Journal Prompts

描述一次你通过索引快速找到重要信息的经历。

如果你要为你的生活做一个索引，你会包含哪些关键词？

讨论在数字化时代，纸质书索引是否还有存在的必要。

解释为什么在处理大数据时，索引的作用至关重要。

写一段关于图书馆员如何编制索引的想象性文字。

Frequently Asked Questions

10 questions

Yes, in the context of books, it specifically refers to the index at the back. However, in modern technology, it also refers to database indices or search engine indices which are invisible data structures.

It is rarely used as a verb in daily life. You wouldn't 'index' your kitchen. You would 'organize' (整理) it. It is mostly a verb in IT or academic contexts.

The most common measure word is '个' (gè), as in '一个索引'. In more formal contexts, you can use '份' (fèn), as in '一份详细的索引'.

The term for 'search engine' is '搜索引擎' (sōusuǒ yǐnqíng). While '索引' is part of how they work, it is not part of the name itself.

You say '索引网站' or '被搜索引擎索引'. For example: '我的网站被收录/索引了'.

Yes, '引得' is an old-fashioned transliteration of 'index'. You will only see it in historical academic texts. '索引' is the standard modern term.

Not directly. 'Citation' is '引用' (yǐnyòng). However, 'Citation Index' is '引文索引', which is a list of citations.

It is '倒排索引' (dàopái suǒyǐn). This is a very common term in computer science.

Yes, it is quite formal. In casual talk, people might just say '后面的表' (the table at the back) or '查一下' (look it up).

You say '字母顺序索引' (zìmǔ shùnxù suǒyǐn) or simply '字母索引'.