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近年来,随着全球气候变暖使北冰洋(日本称为北极海)的冰盖融化加速。据2009年4月美国有关方面发表的报告称,在30年以内夏季
In recent years, the melting of the ice sheet of the Arctic Ocean (known as the Arctic Sea in Japan) has accelerated as global warming has taken place. According to a report released by the U.S. authorities in April 2009, the summer season is within 30 years