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  1. hypersonic

    • IPA[ˌhīpərˈsänik]

    美式

    • adj.
      relating to speeds of more than five times the speed of sound (Mach 5).;relating to sound frequencies above about a thousand million hertz.
    • 更多解釋
    • IPA[hʌɪpəˈsɒnɪk]

    英式

    • adj.
      relating to speeds of more than five times the speed of sound (Mach 5).

    Oxford Dictionary

  2. 知識+