The upper layer of the atmosphere is referred to as the heterosphere because it has several layers of different gases.

高层大气包括气体成分不同的几个层，所以也叫非均质层。

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The upper layer of the atmosphere is referred to as the heterosphere because it has several layers of different gases.

高层大气包括气体成分不同的几个层，所以也叫非均质层。

youdao