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  1. Oxford American Dictionary

    sonic boom

    • IPA[ˈsänik bo͞om]

    美式

    • n.
      a loud explosive noise caused by the shock wave from an aircraft traveling faster than the speed of sound.

    • noun: sonic boom, plural noun: sonic booms

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    sonic boom

    英式

    • n.
      a loud explosive noise caused by the shock wave from an aircraft or other object travelling ...

    Oxford Dictionary