一种气压的分布情况，其中给定体积内的空气质量，即空气的密度，不仅仅是气压的函数。
A distribution of air pressure and the mass of a given volume of air such that the air density is not a function only of atmospheric pressure.
气压的-种分布情况，给定体积内空气质量，即空气的密度，仅仅是气压的函数。
A distribution of air pressure and the mass of a given volume of air such that the air density is a function of only atmospheric pressure.
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