他说了一些话，他真的不知道那些话从哪里来。他真的不知道什么让他奶奶对那些话如此生气。

He says something, and he doesn't really know where those words come from. He doesn't really know what makes his granny so angry about those words.

youdao

有时我真的不知道什么是一个来自另一个星球可能报到，对我们的生活方式。

I sometimes wonder what a being from another planet might report back about our way of life.

youdao

说句实话,我很少欠别人什么人情, 但是这次我欠你的, 真的不知道什么时候才能还清.

To be honest, I seldom receive others’ favor, but this time I really owe you a lot and do not know when I can pay you back.

youdao

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

It's possible that he genuinely didn't know what to do, that he wasn't smart enough to understand that he needed to point to the other one.

有可能他是真的不知道该做些什么,他还不够聪明,无法理解他需要指向另一个物体

耶鲁公开课 - 心理学导论课程节选

I've explained my embarrassment about using terms that I really have no absolutely no idea of the meaning of except that I'm told what the meaning of them is in the books that I am reading, which are the same books that you're reading.

我已经解释过了，用这些我完全不知道什么意思的词,真的很尴尬，除非有人告诉我他们是什么意思,就像这本书里说的那样,而我读的这本书，也就是你们现在也在读的。

耶鲁公开课 - 文学理论导论课程节选