In the meantime, the amount of CO2 in the air is rapidly approaching the limits proposed by the Intergovernmental Panel on Climate Change (IPCC).

与此同时，空气中的二氧化碳含量正迅速接近政府间气候变化专门委员会（IPCC）提出的上限。

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The shape of a snow crystal may change from one form to another as the crystal passes through levels of air with different temperatures.

VOA: special.2010.01.05

While your oil is changed, the sales associates will offer to change your air filter, perform a transmission fluid change and do a variety of other more profitable services in the hopes of increasing the profit margin.

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Any change to air quality in the mine means rescuers have to adjust their mix from above ground.

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Once inside, keep your windows closed, change your air filters, and run your air conditioner, Dr. Kao adds.

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