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which 指物，在定语从句中作主语或宾语。（作宾语时可省略）

A dictionary is a book which gives the meaning of words. 词典是解释词的意义的书。（作主语）

This is a book (which)I bought yesterday. 这就是我昨天买的那本书。（作宾语）

注：which引导的定语从句还可以修饰前面的整个主句，此时which相当于and this。如：

He won the first prize in the competition, which made his parents very happy.

他在竞赛中获得一等奖，这使他的父母感到高兴。

The weather turned out to be very fine, which was more than we could expect. 天气变晴了，这出乎我们的意料。