我不知道是什么东西使他不停地追逐它。

I didn't know what kept him running after that.

youdao

他不知道是什么东西惊醒了他，也不知道他睡了多久。

He had no idea what had awoken him or how long he had been asleep.

youdao

我也不知道是什么东西突然叫我想去跑步(也许是电视节目激起了我的兴趣)。

Again, I'm not sure what prompted me to suddenly want to become a runner (maybe I saw some TV program that sparked my interest).

youdao

This is on purpose, because one of the things I hope you have learned to do this semester, is look up things you don't know, and figure out what they do. What they mean.

我举这个程序是有目的的，因为我希望你们这续期能学到,如何去查找你不知道的东西并，且弄懂它,们是干什么的，是什么意思。

麻省理工公开课 - 计算机科学及编程导论课程节选

I was curious; I was even a user assistant at the time, I was certainly a geek at the time and yet I had no sense really of what actually went on in a classroom like this.

我很好奇，在当时我是一名助教，那时我肯定是一个怪胎,我真的不知道,这样的课上讲的是什么东西。

哈佛公开课 - 计算机科学课程节选

Maybe you don't even know what this-- do you all know what carbon paper-- I guess you do know what this is, right?

或许你们甚至都不知道这是什么东西-,你们都知道复写纸吗-,我猜你们都知道这是什么，对吧？

耶鲁公开课 - 金融市场课程节选