The engine is like a cool fan, if it stop, you can see , the pilot sweating……

引擎就像个大风扇，如果他停转了，你看吧，飞行员就开始冒汗了……

youdao

One cattail leaf fan can be used to cool the air.

一个香蒲叶风扇可用于冷却空气。

youdao

Set up a fan a few feet in front of the treadmill for a cool breeze while you daydream about summer beach walks.

在跑步机几英尺前面放一个吹冷风的风扇。 权当你想像一下自己在夏季的海岸上行走，海风吹拂的感觉。

youdao

But a lot of space is occupied by a massive fan that the supersonic chip needs to keep cool.

CNN: Life at One Gigahertz

On top of that, dairies are facing higher feed costs and the additional expenses of fan and sprinkler systems to keep the cows cool day and night.

FORBES: Dairy

Gamers do not have to worry about excess heat while having all of their settings cranked up, keeping the laptop cool is accomplished by an efficient and quiet design using a larger, single omni-directional blower fan and dual heat pipe and heat sink system, minimizing the noise and increasing the efficiency over other designs that utilize two smaller and louder blowers.

ENGADGET: Maingear announces Nomad 15 gaming laptop: small in size, big on specs