One day, when Laozi was traveling through the Hangu Pass in Henan from the east, a purple mist suddenly appeared in the air.

一天，当老子正从东边经过河南的函谷关时，一缕紫色的薄雾突然出现在空中。

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The air is different in different places; it is the local atmosphere, the medium through which pass the history of the place and the ideas there indwelling.

不同地方有不同空气；当地氛围，传递当地历史的媒介，还有根深蒂固的思想观念。

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They breathe in air, then extract the oxygen and pass it into the bloodstream, where it's rushed off to the tissues and organs that require it to function.

他们吸入空气，然后把氧气提取出来并进入血液的流动中，被带到需要氧气来维持功能的组织和器官中。

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Ventilation can involve either 100 percent fresh air in which outside air enters and leaves the cabin in a single pass or a system in which various fractions of air are recirculated from the aircraft cabin and mixed with fresh air.

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The scent of wild mint hangs in the air as we pass dusky ravines where baboons swing from the fig trees, swerving past brilliant white bones stripped of flesh by vultures.

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