"They do have to undertake reforms that include political, economic as well as security reforms.

VOA: standard.2009.09.04

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