You couldn't just run something successfully in a cycle and get work out of it, using the heat from the hot reservoir, without also converting some of the heat that came in to heat that would flow into a cold reservoir.

如果一样东西在循环工作过程中,只有热从高温热源中流出，而没有热流入低温热源，那么此过程,不可能对外做功,不可能把所有热。

麻省理工公开课 - 热力学与动力学课程节选

but it's not really, really hot. It might get hot like in end of August.

但是不会真的很热，可能会像八月底一样。

关于伦敦的天气 - SpeakingMax英语口语达人