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  1. Oxford American Dictionary

    vocal sac

    • IPA[ˈvōkəl sak]
    • n.
      (in many male frogs) a loose fold of skin on each side of the mouth, which can be inflated to produce sound.

    • noun: vocal sac, plural noun: vocal sacs

    • 更多解釋

    vocal sac

    • n.
      (in many male frogs) a loose fold of skin on each side of the mouth, which can be inflated to ...

    Oxford Dictionary