1. aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers. 
   水生食肉型哺乳动物，流线型身体适于游泳，鳍状肢。
2. terrestrial or aquatic flesh-eating mammal; terrestrial carnivores have four or five clawed digits on each limb. 
   陆栖或水栖的食肉类哺乳动物；陆栖类的每个肢体上有四或五个带爪的趾。
3. large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales; dolphins; porpoises; narwhals. 
   大型水生食肉哺乳动物，前肢象鳍、无后肢，包括：；鲸；海豚；鼠海豚；独角鲸。
4. A wide, flat limb, as of a seal, whale, or other aquatic mammal, adapted for swimming. 
   鳍，鳍足海豹、鲸或其它水生哺乳动物的宽而扁的适于游泳的肢
5. These mechanisms, part of the marine mammal diving response, are adaptations to living in an aquatic environment and help during the process of sleeping. 
   这些机制作为部分海洋动物潜水的反应，是对在水生环境中生活的适应，并有助于睡眠。

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