Time to get back to work, back to learning.

又是开始工作，学习的时间了。

麻省理工公开课 - 固态化学导论课程节选

get back to the initial point is going to require some input from outside, like heat or extra work or extra heat or something because you've done an irreversible process.

如果要逆转它,回到初始点，就需要外界的投入，比如额外的功，额外的热量等等,因为你进行了一个不可逆过程。

麻省理工公开课 - 热力学与动力学课程节选

What you've built is an engine. You cool, you heat, you heat, you cool, you get back to the same place, but you've just done work to the environment.

这就是热机，我们用燃料或者热源加热，然后把它，与大气接触让它冷却。

麻省理工公开课 - 热力学与动力学课程节选