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

So, ideally what we did see was, in fact, it does have enough energy with the UV lamp, it wasn't a dramatic shift you saw because we didn't start very high and then it went to that stuck point.

所以，理想上我们所看到的，事实上，紫外灯没有足够的能力，因为我们没有从非常高开始,所以它没有一个特别显著的移动,然后它又回到了黏着点。

麻省理工公开课 - 化学原理课程节选

It only cares what temperature is. If temperature is constant, there's no change in energy.

如果温度是常数,能量就没有变化，对理想气体。

麻省理工公开课 - 热力学与动力学课程节选

At no other point in the Republic, I think, do we see so clearly the tension between philosophical reflectiveness. on the one hand, in the sense of camaraderie, mutuality and esprit de corps necessary for political life on the other.

理想国》书中再也没有其它情节，能将这般清楚地将张力,展现在哲思深虑，化作同伴忠诚、相互关系及团队精神之间,且是天秤另一端之,政治生活所必备。

耶鲁公开课 - 政治哲学导论课程节选