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sharks A subgroup of cartilaginous fishes; usually large, fast swimming, fish-shaped predators. Together with the skates and rays they form the Selachii or Elasmobranchii. 鲨鱼类一个软骨鱼类的子群；通常大型、快速的游泳、鱼形的掠食者。与魟和鳐在一起，皆来自鲨亚纲或板鳃亚纲。