It was this midcontinental corridor between two massive ice sheets—the Laurentide to the east and the Cordilleran to the west—that enabled the southward migration.

正是这条位于两块巨大冰原之间的大陆中部走廊——东部是月桂树冰原，西部是科迪勒兰冰原——促成了向南的迁移。

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Because of the barrier of ice to the east, the Pacific Ocean to the west, and populated areas to the north, there may have been a greater impetus for people to move in a southerly direction.

因为东面有冰的屏障，西面是太平洋，而且北面是人口稠密的地区，所以促使人们向南迁移的动力会更大。

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Along the east coast of the United States, the southernmost advance of this ice is recorded by the enormous sand and drift deposits of the terminal moraines that form Long Island and Cape Cod.

沿着美国东海岸，最南边的冰川运动被大量的沙子和终碛石的漂流沉积物（形成了长岛和科德角）所记录下来。

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The lake's location in the heart of the East Antarctic Ice Sheet makes it one of the most inhospitable environments on the planet.

BBC: Antarctic Lake Vostok yields 'new bacterial life'

This research could help scientists find out more about possible life in Lake Vostok, the largest of over 70 sub-glacial lakes on the White Continent, which lies more than four km beneath the East Antarctic Ice Sheet.

BBC: Antarctic lake's secret water

They are also warning of ice affecting East Anglia, southern England and south Wales.

BBC: Snow shuts schools and hits travel