So, if you feel there's not enough math used, I guarantee you that I certainly know enough eventually to snow the whole class, but that's not the point.

如果你觉得我用的数学太少,我可以保证,我知道的数学知识,足以难倒在座的所有人,但这不是重点

耶鲁公开课 - 基础物理课程节选

So it's not to be used when you just feel sort of "Nahhhh, I don't know."

所以，当你仅仅是觉得“嗯……我不清楚”的时候，不能用这个句型。

I hate 课堂 - SpeakingMax英语口语达人