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.
汉堡动物权益组织Four Paws的野生动物专家托马斯•皮什指出，“但北极熊不能圈养，他们需要空间，北极的气候更适合他们。”
They made a fortune out of him, " says Thomas Pietsch, a wildlife expert at the Hamburg-based animal-welfare group Four Paws. "But it's wrong to keep polar bears in captivity.
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