introduction

The host made the formal introductions before dinner was served.

(Chinese) 主人在晚餐前做了正式的介绍。

I'd like to thank John for his kind introduction to the professor.

(Chinese) 我要感谢约翰把我介绍给教授。

The introduction of the book explains the author's motivation for writing it.

(Chinese) 书的序言解释了作者的写作动机。

In the introduction to his speech, he shared a funny personal story.

(Chinese) 在演讲的开头，他分享了一个有趣的个人故事。