introduction
noun uk/ˌɪn.trəˈdʌk.ʃən/ us/ˌɪn.trəˈdʌk.ʃən/
(PUT INTO USE)
B2 [ U ]采用；引进；推行；放入，插入
an occasion when something is put into use or brought to a place for the first time
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.
(GIVING SB'S NAME)
B2 [ C or U ]介绍，引见
the action of telling someone another person's name the first time that they meet
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。
(BEGINNING)
B2 [ C ]开始
the first part of something
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。
(FIRST EXPERIENCE)
C1 [ S ]首次（经历，接触某事）
the first time someone experiences something
That trip was my introduction to winter sports. 那次旅行是我第一次接触冬季运动。
(BASIC KNOWLEDGE)
B2 [ C ]入门（图书，课程）
a book or course that provides basic knowledge about a subject
an introduction to psychology 心理学入门