或者不如说，我知道他是谁。

Or rather , I know who he is.

youdao

是的我知道他是谁但为什么我要当他?。

Leonard: Yeah, I know who it is, but why is it me?

youdao

如果我知道他是谁，我不会这么鲁莽。

If I'd known who he was, I wouldn't have been so rude.

youdao

This guy--I don't know who he is but he seems to be on a lot of these things but the thing is you don't need to rely on him.

这个家伙，我不知道他是谁,不过他看起来在很多这类地方出现,但你不必依赖他做的表情。

耶鲁公开课 - 心理学导论课程节选