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动物迁徙是自然界一类动人的现象。有的迁徙以速度快著称,有的迁徙以规模见长,有些迁徙距离之远和时间之长让人叹为观
Animal migration is a kind of moving phenomenon in nature. Some are known for their speed of movement, some are known for their scale, some are far away and have a long way to go