pron. 哪一个;哪一些;哪个;那,指前面提到的事物
adj. 哪一个;哪一些
网络 哪些; 哪一些; 那一个
The lioness rejected the smallest cub, which died.
母狮排斥最小的幼狮,把它饿死了。
They all look so alike to me that I´m never sure which is which.
它们在我看来简直一模一样,我永远分不清哪个是哪个。
It was difficult for the inspectors to discover which documents were important and which were not.
检查员们难以发现哪些文件重要,哪些不重要。
Which direction are you facing?
你面朝哪个方向?
Which planets can sustain life?
哪些行星可以维持生命的存在?