You're allowed Cv comes out here for this adiabatic expansion, which is not a constant volume only because this is always true for an ideal gas.

绝热过程写下,这个式子是因为它对理想气体都成立，并没有用到等容过程的条件,只用了理想气体的条件。

麻省理工公开课 - 热力学与动力学课程节选

And again there, too, you saw an experimental result you were presented with that says, well at least to the extent that it could be measured, it was obviously getting very small.

再一次，你看到了一个,你经知道的实结果，至少在实验测量的范围内，对理想气体条件下的气体这一项很小。

麻省理工公开课 - 热力学与动力学课程节选

We tend to think of the separation of powers doctrine as necessary for the security and liberty of the individual ? don't we?

我们倾向于,将分权原理想成是,个人安全与自由的必备条件,不是吗？

耶鲁公开课 - 政治哲学导论课程节选

We know there is no thing called a massless rope, but most ropes have a mass, but maybe negligible compared to the two blocks you are pulling, so we'll take the idealized limit where the mass of the rope is 0.

我们都知道无质量的绳子是不存在的,是绳子就有质量,但是相比于这两个物体就可以忽略不计了,所以我们有了这个理想的条件,即绳子的质量都是 0

耶鲁公开课 - 基础物理课程节选

The institutional and educational requirements of Plato's Republic share many features with a place like Yale.

柏拉图《理想国》的制度,与教育条件特色,有许多方面和耶鲁是共通的。

耶鲁公开课 - 政治哲学导论课程节选

dV we're still going to write that it's an ideal gas.

理想气体的条件,也依然成立。

麻省理工公开课 - 热力学与动力学课程节选