one of two parts like arms on the bodies of some sea creatures, such as seals and penguins, used for swimming(海豹、企鹅等海洋生物用来游泳的)鳍肢,鳍足
US also fin a type of large, flat rubber shoe used for swimming, especially underwater(尤指潜水用的)橡皮脚掌,脚蹼,鸭脚板
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