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

After a Raptors timeout, Chris Andersen converted a three-point play and Wade made two free throws, capping a 12-0 run that put the Heat up 89-77 with 7:42 left.

NPR: Heat Pull Away From Raptors, Win 22nd Straight

Toronto closed the gap with a 6-0 run, but a 3 by James with less than 3 seconds left put the Heat up 55-43 at the break.

NPR: Heat Pull Away From Raptors, Win 22nd Straight

In New York, Fashion Week, a series of designer showings with some activities held under tents, went on mostly as scheduled, though organizers put on additional crews to deal with the snow and ice, turned up the heat and fortified the tents.

WSJ: Behemoth storm drops 2 feet of snow on Northeast