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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Mr. Obama will mark time, but henceforth he will not define the national agenda.

他标志着这个时代，但仅此而已，他无法在国家大事上树立里程碑。

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Parties to the Convention are also encouraged to mark the fifth anniversary in national forums.

同时鼓励公约各缔约方采用国家论坛形式开展五周年纪念活动。

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The national security challenge comes at a difficult time for Mr.Obama, who later this month will mark his first year in office.

VOA: standard.2010.01.06

Kenya, the ancestral home of his father, declared a national holiday to mark his victory.

FORBES: Africa And Obama: What The Continent Should Do In His Second Term

I'm glad you all could join us today as we mark National Mentoring Month here at the White House.

WHITEHOUSE: Celebrating National Mentoring Month

Quins have also announced that England Under-20 and National Academy coach Mark Mapletoft will take over as assistant coach next season.

BBC: Ollie Smith signs for Harlequins