高层大气包括气体成分不同的几个层，所以也叫非均质层。
The upper layer of the atmosphere is referred to as the heterosphere because it has several layers of different gases.
低层大气由均质的混合气体组成，所以也叫均质层。
The lower atmosphere is referred to as the homosphere because it has a uniform mixture of gases.
低层大气由均质的混合气体组成，所以也叫均质层。
The lower atmosphere is referred to as the homosphere because it has a uniform mixture of gases.
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