and they did it,". He says reforms undertaken by communist dictatorships never lead to systemic change without an active opposition creating what he calls a "civil society movement."

VOA: standard.2009.11.03

Now, you can have a change of temperature without any heat being involved.

不进行热量传递也可以改变温度,想象有一个热绝缘的盒子。

麻省理工公开课 - 热力学与动力学课程节选

Now, you can have a change of temperature without any heat being involved.

不进行热量传递也可以改变温度,想象有一个热绝缘的盒子。

麻省理工公开课 - 热力学与动力学课程节选