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今天幫RYAN準備的英文小文章
Polar Bears
Polar bear cubs stay near their mother for warmth.
The cubs themselves have thick coats of fur and layers of fat to keep them warm.
A pregnant female will dig a den in the fall, then stay there until her cubs are born and ready to leave the den (at bottom).
The mother will protect and nurse the cubs for about two and a half years.
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