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  1. Oxford Dictionary

    sound barrier

    英式

    • n.
      the increased drag, reduced controllability, and other effects which occur when an aircraft approaches the speed of sound, formerly regarded as an obstacle to supersonic flight.

    • noun: sound barrier, plural noun: sound barriers

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    sound barrier

    • IPA[ˈsoun(d) ˌberēər]

    美式

    • n.
      the increased drag, reduced controllability, and other effects which occur when an aircraft ...

    Oxford American Dictionary