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  1. mesosphere

    • IPA[ˈmɛsə(ʊ)sfɪə]

    英式

    • n.
      the region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 50 and 80 km in altitude.
    • noun: mesosphere

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    • IPA[ˈmezəˌsfir]

    美式

    • n.
      the region of the earth's atmosphere above the stratosphere and below the thermosphere, ...

    Oxford American Dictionary