她突然想到：“谁会知道呢？”

It suddenly occurred to her, "Who knows?"

youdao

谁会知道在这一大堆东西下面还有张桌子。

Who knew there was a desk under there?

youdao

死亡之后会是什么，谁会知道？

What may come after death, who knows?

youdao

You might say, this should have been obvious to someone, but it had never been written up well before.

有人可能会说,这谁都知道,但之前从未有人记录下这个概念

耶鲁公开课 - 金融市场课程节选

Who knows the degree of honesty that he would bring to our question if he were here?

谁知道,如果他在这他会带几分诚实来回到我们的问题呢？

耶鲁公开课 - 弥尔顿课程节选

I will randomly pair your form with another form and neither you nor your pair will ever know with whom you were paired.

我会随机把你们分成两两一组,你们不知道会跟谁分到一组

耶鲁公开课 - 博弈论课程节选