Question

which在逗号后面引导什么从句？

Answer 1

您好，是常见的非限制性定语从句，当去掉这个从句时，不影响句子的基本意思，所以是非限制的，例如下面黑色部分是非限制性定语从句：

The book, which is white, is borrowed from the library.

当去掉 which is white 时，句子 the book is borrowed from the library 的意思没变。