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  1. exosphere

    • IPA[ˈɛksə(ʊ)sfɪə]

    英式

    • n.
      the outermost region of a planet's atmosphere.
    • noun: exosphere, plural noun: exospheres

    • 更多解釋
    • IPA[ˈeksōˌsfir]

    美式

    • n.
      the outermost region of a planet's atmosphere.

    Oxford American Dictionary