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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. 鯊魚類一個軟骨魚類的子群；通常大型、快速的遊泳、魚形的掠食者。與魟和鰩在一起，皆來自鯊亞綱或板鰓亞綱。