The seal has a thick layer of fat under its skin to protect it from cold water in which it swims.

海豹皮下有一层很厚的脂肪，使它在冰冷的水中游泳时能够御寒。

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The seal has a thick layer of fat under its skin to protect it from cold water in which it swims.

海豹皮下有一层很厚的脂肪，使它在冰冷的水中游泳时能够御寒。

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