Commerce is more certain to be in the air than the Beijing smog.

商业比北京的雾霾更加确定的充斥于空气之中。

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The National Parks in England are called "England's Breathing Spaces" because they are places where people can go to be in the open air, away from the dirt and noise of cities.

英国的国家公园被称为“英国的呼吸空间”，因为在那里人们可以远离城市的尘土和噪音，享受户外的空气。

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After a day of air and activity, you should be in the mood for a good meal.

在户外活动了一天，你应该想好好吃一顿。

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He says the bacteria can also float around in the air and be easily pulled into the lungs.

VOA: special.2009.10.13

This says, if you want to be in the air for a long time, so you may think that 90 degrees is the best angle.

也就是说,如果你想在空中停留更久,你也许会认为 90°是最佳选择

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that whatever it is, it's going to be delicious, because of the delicious aroma in the air.

不管他们做的是什么，肯定很美味，因为空气中漂浮着食物的诱人香味。

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This allows more planes to be in the air more safely and able to fly more direct routes.

BBC: The futurist: The US�� new air traffic control system

The father, believed to be in the Air Force, was returning home, Richardson said.

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Although Libya denied making the offer, a deal seemed to be in the air.

ECONOMIST: George Bush visits Europe