And all this is, is saying that when you take a mixed second derivative, it doesn't matter in which order you take the two derivatives.

麦克斯韦关系的本质是,当你考虑混合的二阶导数时，求导的顺序不影响最后的结果,现在，我们利用这些关系。

麻省理工公开课 - 热力学与动力学课程节选

I look at something and I know what it is, forgetting that possibly I only know what it is because of a context in which indeed it is not those other things that are linked to it.

而我认知一样东西，很可能并不知道它的本质是什么,而是以它和其他事物的,关系来认知它。

耶鲁公开课 - 文学理论导论课程节选

This raises a question. Whether the relation between contemporary political science and liberalism is merely accidental or whether there is some intrinsic some necessary connection between them.

这导出一个问题，当代政治科学,与自由主义的关系仅是偶然,或之间，有些本质的,一些必然的,连结介于两者之间。

耶鲁公开课 - 政治哲学导论课程节选

Now, here's another document that you want to be aware of that gives you some idea of what the Greeks fairly early thought the polis was for and about, and what the relationship between individual and polis was.

现在,这有另一份你们应该注意的材料,它能让你了解一些早期希腊人,是如何认识城邦的作用和本质,以及个人与城邦之间的关系的

耶鲁公开课 - 古希腊历史简介课程节选

All right, now what we're going to learn next time and Bob Field is going to teach the lecture next time, is how heat and work are related, and how they're really the same thing, and how they're related through the first law, through energy conservation.

这节课就到这里,下节课将由Bob，Field讲授,我们将学习功与热量的关系，认识到它们在本质上的相同之处，并通过热力学第一定律，亦即能量守恒定律，把它们联系起来。

麻省理工公开课 - 热力学与动力学课程节选