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单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级美国国家地理杂志图片欣赏
Polar BearsOn Thin IceThe Arctic is warming so fast that by 2050 it may be largely ice free in summer. Without their frozen hunting platform how will polar bears surviveBy Susan McGrathPhotograph b
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THE MORE THINGS CHAN
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