德国不莱梅大学的查尔斯·罗伯特和他的同事们认为他们得出了一种答案。
Now Charles Robert of the University of Bremen, Germany, and colleagues think they have an answer.
德国布莱梅大学的科学家们今年夏天所公布的数据比国家冰雪数据中心公布的这个还要低。
Scientists at the University of Bremen in Germany reported even less ice this summer than the NSIDC.
不莱梅大学的学者Stefan Luft说，在大城市里，移民的孩子们聚集在没有德国本地孩子的地方，然后去学校，这就使移民的孩子和德国本地的孩子很难融合在一起。
In big cities they crowd together and go to schools from which native German children have fled, making it harder to integrate, says Stefan Luft, a scholar at the University of Bremen.
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