introduction/ ɪntrə'd^kʃən /

1.noun [of new idea] [ measure] [ technology] 
引进

2.noun [c] [of person] 
介绍

3.noun [of book] [ talk] 
(beginning) 引言

4.noun
China's introduction to British ballet (first experience of sth) 中国首次接触英国芭蕾

5.noun
an introduction to linguistics (presentation of basic facts) 语言学入门

letter of introduction
介绍信
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