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mesopause n.【氣象學】中間層頂。

mesopelagic

Noctilucent clouds are ragged extensions of a more widespread and more permanent layer which forms over the summer polar area at the mesopause . 夜光云是在夏季極地中圈頂之上形成的更廣泛更持久的層的參差不齊的延伸。