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引言;序言;导论
The introduction to a book or talk is the part that comes at the beginning and tells you what the rest of the book or talk is about.
例句
Ellen Malos, in her introduction to 'The Politics of Housework', provides a summary of the debates.
埃伦·马洛斯在她为《家务政治学》一书所作的序言中对这些争论进行了总结。
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入门书;初阶读物
If you refer to a book as an introduction to a particular subject, you mean that it explains the basic facts about that subject.
例句
On balance, the book is a friendly, down-to-earth introduction to physics.
总而言之,这是一本通俗而务实的物理入门书。
...'Psychology and Language: An Introduction to Psycholinguistics'.
《心理学与语言：心理语言学入门》
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外来品;新引进的东西
You can refer to a new product as an introduction when it becomes available in a place for the first time.
例句
There are two among their recent introductions that have greatly impressed me.
在他们最近引进的东西里面有两样给我留下了非常深刻的印象。
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PHRASE
众所周知;无需介绍
If you say that someone or something needs no introduction, you mean that they are so well known that everyone knows who or what they are.
例句
Michael Jackson, of course, needs no introduction.
迈克尔·杰克逊,当然,众所周知。