The difficulty of this course consists in the fact that it teaches what you already know.

这门课程的难度，就在于,传授的都是你们已有的知识。

耶鲁公开课 - 公正课程节选

now let's go back to each of our individual steps and look, based on what we know about how to evaluate the thermodynamic changes that take place here, let's look at each one of the steps and see what happens.

让我们回到循环中的每一步,然后看看，基于我们已有的知识,来估计一下,发生的热力学变化，让我们看,循环中的每一步发生了什么。

麻省理工公开课 - 热力学与动力学课程节选