air bladder
柯林斯词典
1. N an air-filled sac, lying above the alimentary canal in bony fishes, that regulates buoyancy at different depths by a variation in the pressure of the air 鱼鳔 (Also called swim bladder)[ichthyol]
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1. N an air-filled sac, lying above the alimentary canal in bony fishes, that regulates buoyancy at different depths by a variation in the pressure of the air 鱼鳔 (Also called swim bladder)[ichthyol]