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1. Oxford American Dictionary

   ionosphere

   • IPA[īˈänəˌsfir]

   美式

   • n.
     the layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above the mesosphere and extends from about 50 to 600 miles (80 to 1,000 km) above the earth's surface.；a region similar to an ionosphere above the surface of another planet.

   • noun: ionosphere

2. • 更多解釋

   ionosphere

   • IPA[ʌɪˈɒnəsfɪə]

   英式

   • n.
     the layer of the earth's atmosphere which contains a high concentration of ions and free ...

   Oxford Dictionary