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单词 exosphere
释义
ex·o·sphere (ĕksō-sfîr)
n.
1. The outermost region of a planet's atmosphere.
2. The outermost region of the earth's atmosphere, lying above the thermosphere and extending thousands of kilometers into space, from which molecules having sufficient velocity can escape the earth's gravitation.

exo·spheric (-sfîrĭk, -sfĕr-) adj.
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