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I had to step outside for a breath of fresh air.

我得到外面去透口气。

《柯林斯英汉双解大词典》

Overall, together with global tobacco control activities and initiatives on healthy indoor air, the Project is expected to be a key step towards reducing lung cancer risk word wide.

在总体上，该项目与全球烟草控制活动和健康室内空气行动一起，预期将成为向减少世界范围内肺癌风险迈出的关键性的一步。

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While doing his famous "Moonwalk" step, he seemed to be walking backwards on air.

VOA: special.2009.07.05

"We must move away from this blanket closure and find ways to flexibly open air space, step by step, " IATA head Giovanni Bisignani told a news briefing in Paris.

BBC: EU emergency talks called on volcanic ash air chaos

But he says Air is an extra step.

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If we could go one step further and reduce air pollution in affected communities by cutting emissions from cars, trucks and dirty industries, the impact would be even greater.

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