swim-bladder

英[s'wɪmbl'ædər] 美[s'wɪmbl'ædər]
  • pool n.水塘;游泳池n.共同储金;联营;美式撞球v.共用;汇集
  • swimmers 白色有光绒面呢
名词 swim bladder:
  1. an air-filled sac near the spinal column in many fishes that helps maintain buoyancy