"which" 是一个关系代词，主要用于 修饰物。它可以在定语从句中充当主语或宾语，指代前面提到的某个或某些事物。以下是一些具体的用法示例：

修饰物

The book which is on the table is mine.

This is the house which we lived in last year.

在非限制性定语从句中

She is an artist, which I am not.

Water, which is a clear liquid, has many uses.

引导定语从句时，which可以指代主句中的整个内容

In the presence of so many people he was little tense, which was understandable.

which也可以用于指代人的职业、身份、地位等

His daughter became a doctor after graduation, which he liked very much.

总结来说，"which" 主要用于修饰物，在定语从句中充当主语或宾语，也可以指代主句中的整个内容或人的特定属性。希望这些示例能帮助你更好地理解 "which" 的用法。