火星的大气密度不及地球的大。
The atmosphere of Mars is not so dense as that of the earth.
水的密度是空气密度的八百倍。
飞行所需要的动力直接关系与空气密度。
The forces necessary for flight are directly related to air density.
若温度不变，则空气密度的变化与压力乘正比。
Thee density of air varies directly as pressure, with temperature being constant.
冬天：寒冷、空气密度增加、风比较大，气流平稳。
Winter - Cold, dense air, strong winds at times with stable air.
大气压力随高度增加而降低，大气密度也随高度增加而降低。
Atmosphere pressure decreases with increase in altitude and so does the density of atmosphere.
大气压力随高度增加而降低，大气密度也随高度增加而降低。
Atmosphere pressure decreases with increase in altitude and so does the density of atmosphere.
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