If we want to know the total heat added to the system, we can measure it, which is the straightforward thing, but sometimes you want to calculate in advance, or sometimes you want to calculate it on an exam.

如果想知道给系统的总热量，我们可以测量，这是很直接的事情，但有时候我们想事先计算它，或者需要在考试中计算。

麻省理工公开课 - 热力学与动力学课程节选

It's kind of unsettling because we like to know what things are, but at the same time it's not really a big problem because as long as we know about the fact that a certain notion of literature exists in certain communities we can begin to do very interesting work precisely with that idea.

可能会有点让人不安，因为我们总想知道事物的定义，但知不知道,实际上问题不大,只要我们知道在特定群体中对文学有特定的认识,我们就能在这种认识上做文章。

耶鲁公开课 - 文学理论导论课程节选