降温英语是 "cool down"。它来自动词 "cool"，意思是使变冷。例句：

We need to cool down the soup before we serve it. (我们需要在上菜前把汤降温。)

Let's take a break and let the engine cool down. (让我们休息一下，让发动机降温。)

After the argument, they both needed some time to cool down. (争吵后，他们都需要一些时间来降温。)