气体冷却的气体密度增加，为了最大限度地气量进入发动机气缸。
Gas cooling increases density of gas in order to maximize the amount of gas entering the engine cylinder.
该结论跟另外的一个理论相反，那个理论认为：气体冷却的时候会释放引力能，使气体亮起来，这种结构中没有黑洞。
The conclusion runs counter to the alternate theory that the gas lights up as it cools to release gravitational energy--with no black holes in the picture.
众所周知，当气体在定压下冷却时，它的体积减小。
It is well known that when gas is cooled at a constant pressure its volume decreases.
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