The pain is a warning that the body is becoming too hot.

VOA: special.2010.07.27

You know the heat isn't going to flow from a cold body to a hot body without putting some work in to make that happen.

大家知道热量不会自发地,从冷的物理流动到热的物理,除非对它做功。

麻省理工公开课 - 热力学与动力学课程节选

The body stops perspiring. The skin becomes dry and very hot.

VOA: special.2010.07.27