So, over the last few lectures we've worked and struggled so formulate the second and third laws of thermodynamics in addition to the first.

在前几次课中,我们通过努力明确的,给出了热力学,第一，第二和第三定律。

麻省理工公开课 - 热力学与动力学课程节选

It's almost as important as the second law of thermodynamics, which you'll see in a week or so.

几乎同热力学第二定律,一样重要，你们将在接下来的几周时间里看到这点。

麻省理工公开课 - 热力学与动力学课程节选

So what we did is, remember we started with the second law. Right?

我们所做的是，还记得我们是从热力学第二定律开始的？

麻省理工公开课 - 热力学与动力学课程节选

We could choose any two quantities, and, in fact, it turns out that these are going to prove, after we have the second law, not to be the best choice.

我们可以任选两个物理量，其实，在学习了热力学第二定律之后，我们可以证明，这样的选择并不是最好的。

麻省理工公开课 - 热力学与动力学课程节选

I'll show those again, but what I want to do mostly today is try to put a mathematical statement of the second law in place that corresponds to the verbal statements that we saw last time.

今天我还将跟你们讲这些，但今天的重点是,对上次口头表述内容中的热力学,第二定律,的数学推导,我们上次看到的。

麻省理工公开课 - 热力学与动力学课程节选

So what we're going to do is consider the first and second laws.

我们需要考虑的是,热力学第一和第二定律。

麻省理工公开课 - 热力学与动力学课程节选

It might suggest that you could convert all the work to heat.

它暗示我们可以把所有的功转化为热,但是热力学第二定律说。

麻省理工公开课 - 热力学与动力学课程节选

So you know, what the second law is doing, in other words, it's putting these restrictions on how well or how effectively we can convert heat into work in the case of the engine, or work into heat extracted in the case of a refrigerator.

你们知道，在热机中，热力学第二定律的作用，换句话说，就是给热量,转化为功的效率,施加限制,或在制冷剂中，对抽取热量,进行限制。

麻省理工公开课 - 热力学与动力学课程节选