Let the water cool before you drink it.

把开水晾一晾再喝。

《新英汉大辞典》

It was pretty cool before, but of limited usefulness for me.

虽然从前它也不错，但于我却用处不多。

youdao

Canceling one hour before a date is not cool, most of the date prepping has already started at this point.

提前一个小时取消约会并不酷，大部分的约会准备在这个时间都已经开始了。

youdao

C.D.C.officials say people should put on sunscreen before they leave home, even on cloudy or cool days.

VOA: special.2010.07.06

So you need first to take the liquid helium and cool it below 53 degrees Kelvin before you can do the Joule-Thomson to cool it even further to make liquid helium.

我们首先需要,把温度江都53k一下,然后利用焦耳-汤姆孙实验,来继续冷却它。

麻省理工公开课 - 热力学与动力学课程节选

Fruits and vegetables must be cool from field heat, before they are put into storage.

VOA: special.2009.11.30

Researchers suggested people allow food and drinks to cool slightly before consuming them.

CNN: Vital Signs health tips

But both sides need to cool off before they further damage what is arguably their - and the world's - most important bilateral relationship.

CNN: EMBASSY FIASCO

Let your tea cool off before you drink it.

CNN: Vital Signs health tips