means引导非限定性定语从句，which

which引导非限定性定语从句

I've been busy recent years，which means i don't have much time to watch TV.

1、 which 代替一个词

The government， which promises to cut taxes， will be popular. 这个政府，它保证要减税，将会是得人心的。

2、 which 代替一个短语

Every soldier was wearing earplugs， which made conversation difficult. 每位士兵都戴着耳塞，这便使会话变得困难起来。

3、 which 代替一个句子

It was built in a year， which seems absolutely incredible. 它在一年内就建成了，这简直难以置信。