母亲惊恐得叫道：“他们哪一个是我的孩子？”

The mother screamed with terror, "Which of them was my child?"

youdao

我不确定他们指的具体是哪一个网站。

I'm not sure which website they were referring to.

youdao

这里我要请大家思考的是，哪一个，如果你必须在这两个残忍情境中作出抉择，你会救哪一个？

What I'm inviting you to think about is which one, if you had to choose between these two gruesome scenarios, which one would you rather save?

youdao

So each of these cups again have different weights if I want to find the lightest of them I might start not knowing which is which.

它们的重量互不相同，如果我要,找出最轻的一个，而我根本不知道会是,哪一个。

哈佛公开课 - 计算机科学课程节选

What I'm inviting you to think about is which one, if you had to choose between these two gruesome scenarios, which one would you rather save?

这里我要请大家思考的是，哪一个，如果你必须在这两个残忍情境中作出抉择，你会救哪一个？

耶鲁公开课 - 死亡课程节选

I just don't know which it is, right?

我不知道哪一个是对的

耶鲁公开课 - 博弈论课程节选