Exclusion of air creates a vacuum in the bottle.

瓶子里的空气排除后就产生真空。

《牛津词典》

A cold draught of air blew in from the open window.

一股寒气从敞开的窗户吹了进来。

《牛津词典》

Ensure there is a free flow of air around the machine.

要确保机器周围空气畅通。

《牛津词典》

The American Lung Association said Pittsburgh was last in the nation in one of three measures of air quality.

VOA: special.2009.07.13

It's got that kind of air of profundity about it that philosophy's thought to have or aspires to have.

带有某种哲学思想或追求,所具有的深刻性。

耶鲁公开课 - 死亡课程节选

So, instead of having the periodic variation of water, or the periodic variation of air density here we're talking about an electric field.

不像水或者空气密度的,周期变化，我们这里,讨论的是电场。

麻省理工公开课 - 化学原理课程节选

The odd-shaped boxes on down-town buildings that remind you of air-raid sirens are the antennas.

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The motor uses a whoosh of air to push its two pistons up and down.

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And most important, the Indian low-cost carrier arrived in 2003 with the advent of Air Deccan.

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