which
英 [wɪtʃ] 美 [wɪtʃ]
pron./det.
哪一个;哪一些;(明确所指的事物)…的那个，…的那些;(进一步提供有关某事物的信息)那个，那些
例句
Which period of history would you most like to have lived in?
你最喜欢生活在哪一个历史时期？
We are still friends, though, which is good.
不过我们仍然是朋友，这令人感到欣慰。
There is some noise in the data which needs to be reduced.
资料里有一些需要删除的不适用信息。
