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。
They are the types who shovel your snow, volunteer for school events, and coach the baseball little league – Mark has done all three.
他们会帮你铲除门前积雪、成为学校活动的志愿者和训练小篮球队等---这三项马克全部都参加。
We then report back all the measurements and if it's deemed OK we mark out the landing strip with black bin bags filled with snow.
随后，我们向行动小组报告所有测量结果，一旦符合标准，我们用装满雪的黑色垃圾袋标出跑道的轮廓。
I left only footprints in the snow. But the cabin's mark on me was indelible.
白雪中只留下我的脚印，而小木屋在我心中留下了记忆。
I left only footprints in the snow. But the cabin's mark on me was indelible.
白雪中只留下我的脚印，而小木屋在我心中留下了记忆。
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