没人会知道是什么意思？天知，地知，你知，我知。

What do you mean no one will know? Heaven knows, Earth knows, you know and I know.

youdao

积德虽无人见，行善自有天知。

Merit is nobody see, doing good has its own heaven knows.

youdao

杨震正色道：“天知、地知、你知、我知，怎么说没人知道呢？”

"Yang sternly declared," Heaven knows, earth knows, you know and I know: How can you say no one knows?

youdao

Who knows, they're angry and they're living in this house.

天知道他们会干出什么事,他们是恼怒的住户

耶鲁公开课 - 金融市场课程节选

So who knows how much we should trust it.

天知道它到底有多少是可信的

耶鲁公开课 - 博弈论课程节选

Just like the actual historical Napoleon kept having new beliefs and new desires, if this really was Napoleon in Michigan, he'll start having some new desires and beliefs about Michigan, which perhaps Napoleon never gave any thought to at all.Who knows?

就像历史上真正的拿破仑一样不断涌现新的信念和欲望，如果拿破仑真的出现在密西根，他将开始拥有关于密西根的新信念和欲望，这可能是拿破仑绝对没想到的，天知道呢？

耶鲁公开课 - 死亡课程节选