cooling in retort without pressure

例句：

1. 1.The engine needs to be cooled downbefore it can be started again.
   发动机需要冷却后再启动。
2. 2. During the summer, weuse ice packs to cool down ourpool.
   夏天我们用冰袋来给游泳池降温。
3. 3. The car was left in thesun for too long, and now it's getting too hot to touch.
   车在太阳下晒太久了，现在太热了，无法触摸。