For example,Indian officials blamed extreme heat for killing more than two hundred people in late May.

VOA: special.2010.07.27

It expands. You change your constraints on your system, you heat it up some more, then you take the heat source away, and you put it back in contact with the atmosphere. And you cool it a little bit, change the constraints, cool it a little bit more, and heat, and you've got a closed cycle engine.

让它与大气接触冷却,改变约束，使它继续冷却，然后又再次加热,这就是循环热机，我们以前也研究过，更复杂的机器。

麻省理工公开课 - 热力学与动力学课程节选

Cooler building temperatures in the winter could require more energy to heat the buildings.

VOA: special.2010.03.02

Untreated heat stress can lead to a more serious problem called heat exhaustion.

VOA: special.2010.07.27

They say the effects of more storms, floods,droughts and heat waves will be abrupt and profound.

VOA: standard.2010.01.02

It says these problems are made even more difficult by the sweltering summer heat.

VOA: standard.2009.07.03

(VOICE) The extreme heat,he said, has meant more people dying and more funerals.

VOA: standard.2010.08.10