Polar bears are champion long-distance swimmers among land mammals, and it is not uncommon to find them at sea as far as 50 miles from land or an ice floe.

 
  • 在陸地哺乳動(dòng)物中,北極熊無(wú)疑是長(cháng)距離游泳冠軍。人們經(jīng)常在距離陸地或者大塊浮冰50英里遠的地方看到它們。
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