科研之友
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<正>自然界有许多不可思议的动物,能够激发孩子们的好奇心。准备好用这些有趣的动物事实来打动你的学生吧。A polar bear’ s hair is not white—it’ s colourless. Each thick strand of hair is hollow and reflects the light, making the polar bear appear white.Beneath this transparent fur, the skin is black, to soak up any warmth from the sun and keep the bear as warm as possible.
