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  1. Oxford Dictionary

    swim bladder

    • n.
      a gas-filled sac present in the body of many bony fishes, used to maintain and control buoyancy.

    • noun: swim bladder, plural noun: swim bladders

    • 更多解釋

    swim bladder

    • IPA[swim ˈbladər]
    • n.
      a gas-filled sac present in the body of many bony fishes, used to maintain and control buoyancy.

    Oxford American Dictionary