introductions

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。

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。

Have you read the introduction to the third edition?

你看了第三版的绪论吗？