n.

1. 介绍；正式引见[U][C][P1]
   He was shaking her hand before I could finish the introduction.

   未等我介绍完，他就在握她的手了。

2. 引进，传入[U][（+of/to/into）]
   The government saw the introduction of new technology as vital.

   政府认为引进新技术至关重要。

3. 采用；被采用的东西；引种[U][C]
   Television is a later introduction than radio.

   电视的使用迟于无线电。

4. 引言，序言；序论[C][（+to）]
5. 入门（书）[C][（+to）]
   an Introduction to Biochemistry

   《生物化学入门》

6. 序曲[C]

n.

1. the action of introducing or being introduced.
   ▸a thing, such as a product or plant, that is newly brought in.
2. a formal presentation of one person to another, in which each is told the other's name.
3. a preliminary thing, such as an explanatory section at the beginning of a book, report, etc.
   ▸a preliminary section in a piece of music.
4. a book or course of study intended to introduce a subject to a person.
   ▸a person's first experience of a subject or thing.