如同研究人员指出的，由于北极熊都生活在海冰上，它们的尸体最终留在了海洋中。
As the researchers pointed out, because polar bears live primarily on sea ice, their remains often end up in the ocean.
研究者在文中指出，虽然北极熊是海洋哺乳动物，它们从海洋中获取食物(如海豹)；可是它们不是水栖哺乳动物。
The researchers write that although polar bears are Marine mammals, in that they derive their nutrition from the ocean (i.e. they eat seals), they are not aquatic mammals.
有趣的常识：北极熊的学名叫“海洋熊”，因为它是唯一身体能适应水中生活的熊类。
The polar bear's scientific name means "sea bear" because it's the only bear that has a body made for living in water.
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