Normal air, enriched air or pure oxygen can be used to support combustion.

空气、富气、和纯氧气都可用来支持燃烧。

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This expansion ratio also allows atmospheres of oxygen-enriched air to form in the area surrounding a release.

该膨胀率还导致排气口附近区域形成富氧气氛。

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The method is also available for the design of membranes and the choice of technological parameters for the production of oxygen-enriched air.

它为膜材料的设计、工艺参数的选择提供了一种方便快速的研究手段。

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He enriched the oxygen or the carbon dioxide in the air breathed by experimental subjects and found not a hint of suppression or exacerbation of yawning compared with control subjects breathing normal air.

WSJ: Matt Ridley on Why You Just Yawned | Mind & Matter