An electric fan keeps the air circulating.

电风扇使空气流通。

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The air is circulating.

空气流动。

《新英汉大辞典》

There are to major methods of circulating air in refrigerated vehicles.

在冷藏车里，空气循环可以通过两个方法实现：一是传统的顶部送气法；

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There were crying babies, screaming customers, non-circulating air and way too much stress.

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Once emitted, it persists in the environment for a long time - circulating through air, water, soil and living organisms - and can be dispersed over vast distances.

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The wind gains strength from the thermal energy of the ocean, eventually condensing vapors and circulating air fast enough to form high-speed wind and heavy rain.

CNN: graphic