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.
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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