Mark Serreze, director of the American National Snow and Ice Data Center (NSIDC) in Colorado, thinks that sea level rise is going to be a bigger and bigger problem, as we move through the 21st century.

美国国家冰雪数据中心（NSIDC）位于科罗拉多州，其主任马克·塞雷泽（Mark Serreze）认为，随着我们进入21世纪，海平面上升将成为一个越来越大的问题。

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Subsequent levels leave their mark until another level 0 is done.

后续级别的备份会保留它们的标记，直至执行另一次 0 级备份。

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Still they may count themselves lucky still having a job as half believe unemployment will reach its highest ever level by the quarter century mark.

然而他们可能会觉得自己还有工作还算幸运，因为半数的人相信到2025年失业率将会达到有史以来的最高水平。

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Its skill in understanding fashion trends and the right level of mark-up on merchandise, as well as the proper level of inventory, and the intelligent staffing of stores makes the all the difference.

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However, on a personal level, Mark Linden has not been so lucky.

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