【气】中圈, 中层, 散逸层(离地250哩以上)
〈气〉中间层
[气]中间层
the atmospheric layer lying between the stratosphere and the thermosphere, characterized by a rapid decrease in temperature with height
the solid part of the earth's mantle lying between the asthenosphere and the core
1. the atmospheric layer between the stratosphere and the thermosphere
(hypernym)
(part-holonym)
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1. the atmospheric layer between the stratosphere and the thermosphere(hypernym) (part-holonym) 
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柯林斯
百科