Step three to four isothermal compression, w2 delta u is going to be q2 plus w2.

第三步，到四点的等温压缩，Δu等于q2加。

麻省理工公开课 - 热力学与动力学课程节选

Adiabatic meaning there's no heat involved, and we're going to see how that differs from the isothermal expansion and compression.

绝热意味着没有热量的传递，我们将看到它,与等温过程的区别。

麻省理工公开课 - 热力学与动力学课程节选

Then we're going to have another isothermal step, a compression to some point four.

然后有另外一个绝热过程，绝热压缩到4点。

麻省理工公开课 - 热力学与动力学课程节选