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IELTS BNC: 1379 COCA: 2904
introductionnounuk/ˌɪn.trəˈdʌk.ʃən/ us/ˌɪn.trəˈdʌk.ʃən/

introduction noun PUT INTO USE

B2 [ U ] an occasion when something is put into use or brought to a place for the first time采用；引进；推行；放入，插入

The introduction of new working practices has dramatically improved productivity.采用新的工作方法已经显著提高了生产率。
Within a year of its introduction, questions began to emerge about the safety of the drug.投入使用不到一年，有关这种药品安全的问题就已经出现了。
specialized The introduction of the tube into the artery is a very delicate procedure.将导管插入动脉是一个非常精细的手术。

More examples

The introduction of identity cards has been opposed by the campaign for civil liberties.

Company profits have doubled since the introduction of new technology.

In the 1960s hemlines suddenly shot up with the introduction of the miniskirt.

The introduction of new charges has angered customers.

The minister has called for the introduction of harsher sentences for speeding offences.

introduction noun GIVING SB'S NAME

B2 [ C or U ] the action of telling someone another person's name the first time that they meet介绍，引见

You'll have to do/make the introductions - I don't know everyone's name.你得作个介绍——我可不知道每个人的名字。
My next guest needs no introduction (= is already known to everyone).我的下一位客人大家都认识，就用不着介绍了。

introduction noun BEGINNING

B2 [ C ] the first part of something开始

Have you read the introduction to the third edition?你看了第三版的绪论吗？
The song's great, but the introduction's a bit too long.这首歌很棒，但前奏部分太长了。

introduction noun FIRST EXPERIENCE

C1 [ S ] the first time someone experiences something首次（经历，接触某事）

That trip was my introduction to winter sports.那次旅行是我第一次接触冬季运动。

introduction noun BASIC KNOWLEDGE

B2 [ C ] a book or course that provides basic knowledge about a subject入门（图书，课程）

an introduction to psychology心理学入门

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