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A crustacean of the order Decapoda,such as a crab,lobster,or shrimp,characteristically having ten legs,each joined to a segment of the thorax. 十足目动物十足目的甲壳纲动物，如螃蟹，龙虾，或虾米，其特征是有十足，每一足都与身体中间一节的部分相接。