London may be famous for its red double-decker buses, but it is the underground system, parts of it more than a hundred years old, that is especially vulnerable.

VOA: standard.2010.04.01

If you double everything in the system, the temperature is not going to change, it's not going to double.

如果你把系统中所有的东西增加一倍，温度是不会变的，它不会跟着增加一倍。

麻省理工公开课 - 热力学与动力学课程节选

If you double the system, they double in there numerical number.

如果你把系统扩大一倍，它们的值也会扩大一倍。

麻省理工公开课 - 热力学与动力学课程节选