Before I move on, I'm just going to put on the board another cycle, and I'm going to urge you to work through that on your own.

在我继续之前，我要在黑板上,画另一个循环，我希望你们,能自己去推导它，它已经被详尽地推导过了。

麻省理工公开课 - 热力学与动力学课程节选

And the cycle it's going to undertake is called a Carnot cycle, and it works the following way: we're going to do pressure volume work.

它的循环过程,叫做卡诺循环，过程如下：,这是个压强体积系统。

麻省理工公开课 - 热力学与动力学课程节选

You couldn't just run something successfully in a cycle and get work out of it, using the heat from the hot reservoir, without also converting some of the heat that came in to heat that would flow into a cold reservoir.

如果一样东西在循环工作过程中,只有热从高温热源中流出，而没有热流入低温热源，那么此过程,不可能对外做功,不可能把所有热。

麻省理工公开课 - 热力学与动力学课程节选

There's no change in them, and then we also looked at some at non-state functions, work and heat, and saw that those aren't zero going around a cycle. Of course you can do work in a cyclic process, and heat can be exchanged with the environment at the same time.

它们不会有变化，然后我们研究了,一些非态函数，功和热量，并看到,沿着循环行进一周的话,它们并不是零，当然你可以在,一个循环过程中做功，而同时热量可以在系统,与外界环境之间进行交换。

麻省理工公开课 - 热力学与动力学课程节选