I need a big air conditioner to cool a large volume of space.

我需要一个大的空调去冷却大量的空间。

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Therefore, double screw compressor and worm compressor compared, in the same speed of the units inside less number of exhaust air ripple, big air flow noise.

因此，双螺杆压缩机与蜗杆压缩机相比，在相同转速下单位内排气次数少，气流脉动大，气流噪声大。

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Overhead, the chopper roared and the big blades churned the air.

直升飞机在头顶上轰响着，巨大的浆叶搅动着空气。

《柯林斯英汉双解大词典》

Because of the open-air stage, actors had to shout very loudly and make big motions to be heard and seen by all.

VOA: special.2010.01.06

A big cloud of smoke rose high in the air over Fort Sumter.

VOA: special.2009.08.13

"It is going to be a big anti-incumbent year, and a big anti-Washington year, and what is still left a little bit up in the air after last night is how much that anti-incumbent wave, how disproportionately that anti-incumbent wave, will wash over the Democrats."

VOA: standard.2010.05.19

Airlines have long used the clauses to suspend advertising after a big air disaster.

FORBES

And in between rides, catching big air takes a backseat to catching waves of funding on the beach.

FORBES: Kiteboarding's Serious Business In Silicon Valley

The flights taking the detainees from Afghanistan to Guantanamo won't be nonstop, military sources said Wednesday, because the air field at Kandahar where the detainees are being kept cannot handle a big Air Force transport.

CNN: U.S. may sedate Afghan detainees during flights