The new system harvests this waste heat to drive the evaporation of seawater.

新系统收集这些废热来驱动海水蒸发。

This has two sobering implications for air-conditioning engineers: first, all machines generate inefficient waste heat; and second, deliberately cooling a room requires power.

这对空调工程师来说有两个值得警惕的含义：首先，所有机器都会产生低效的废热；其次， 有意给房间降温需要耗电。

The sun rose and sank, and rose and sank again, and many times after that; and still the boy lay stretched on his uneasy bed, dwindling away beneath the dry and wasting heat of fever.

太阳升起又落下，又升起又落下，此后多次；男孩仍然伸着懒腰躺在他那张不安的床上，在干热的高烧下逐渐消瘦。