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  1. Oxford American Dictionary

    flap valve

    • IPA[flap valv]
    • n.
      a valve opened and closed by a plate hinged at one side.

    • noun: flap valve, plural noun: flap valves

    • 更多解釋

    flap valve

    • n.
      a valve opened and closed by a plate hinged at one side.

    Oxford Dictionary