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1. Oxford American Dictionary

   ionopause

   • IPA[īˈänəˌpôz]

   美式

   • n.
     the upper boundary of the ionosphere of a planet, comet, or other celestial object.

   • noun: ionopause, plural noun: ionopauses

2. • 更多解釋

   ionopause

   • IPA[ʌɪˈɒnəpɔːz]

   英式

   • n.
     the upper boundary of the ionosphere of a planet, comet, or other celestial object.

   Oxford Dictionary