我不知道是什么起的作用，但是我确实觉得好多了。

I don't know what it was that did the trick, but I am definitely feeling much better.

《牛津词典》

我不知道是什么，我不知道什么时候，但我知道它将会发生。

I don't know what and I don't know when, but I know it's going to happen.

youdao

我不知道是什么，他从未向我抱怨。

I don't know what. He never complained to me.

youdao

I certainly didn't understand how they even connected really to chemical reactions, much less other disciplines that I was interested in.

它们这么重要,我并不理解这些分子是什么，我也不知道它们。

麻省理工公开课 - 化学原理课程节选

Does anyone have that in their brain somewhere for ready use? I don't, in fact, so it's actually okay if you don't know all your common ions, if you missed that part.

你们有谁有印象它们有什么用吗？,我当时是不知道，所以如果你们不记得,这部分也没有关系。

麻省理工公开课 - 化学原理课程节选

I have no idea what's here at the moment so I'm just going to draw a question mark because that memory might have been used previously for some other purpose, but we know it's currently available to us so we have four bytes of memory.

我不知道在此刻这里是什么,所以我画一个问号，因为那块内存可能在之前,为其它的目的而使用过，但是我们知道它可以为我们所使用,这样我们就有4个字节的内存。

哈佛公开课 - 计算机科学课程节选