Above some temperature is going to be positive, below some temperature is going to be negative.

低于这一温度它是负数，我们一般忽略这些高阶项。

麻省理工公开课 - 热力学与动力学课程节选

These are the things that we do best and where we have advanced course work available in these three categories and so I'm going to emphasize these three but we'll talk about all of these subjects as we go through the course.

这是我们做的最好的三个方向,在这三个方向下我们开设有高阶的课程,因此我会重点讲这三个方向,但随着课程的进行,所有的主题我们都会讲到

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