In a real engine, of course, you can approach the reversible limit.
在一个真实的热机里，当然，你可以达到可逆极限。
2
So this is some other engine that runs using reversible processes.
这是另一台,利用可逆过程工作的热机。
3
This means that the carnot cycle is an idealization since no real engine processes are reversible and all real physical processes involve some increase in entropy.