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1·It was the midcontinental corridor between two massive ice sheets—the Laurentide to the west—that enabled the southward migration.

正是两块巨大的冰原之间的半大陆性质的通道——西面的劳伦斯泰德冰原——使人们向南迁移成为可能。

2·For example, as the great ice sheets that covered North America during the last ice age steadily melted away, huge volumes of water flowed from them.

例如，随着覆盖北美的大冰原在最后一个冰河时代逐渐融化，大量的水从冰原流出。

3·Ice sheets retreated and sea levels rose.

冰盖消退，海平面上升。

4·Evidence that an ice-free corridor between two ice sheets developed when the continental ice first began to melt came primarily from radiocarbon dating.

当大陆上的冰开始融化时，两块冰原之间形成了一条无冰走廊，这一证据主要来自放射性碳测年法。

5·When an ice age begins, the continental ice sheets grow, steadily reducing the amount of water evaporated from the ocean that will eventually return to it.

当冰河时代开始时，大陆上的冰原逐渐增大，从海洋中蒸发出来的水逐渐减少，而这些水最终又会回到陆地上。

6·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。

7·If you replenish the ice sheets and frozen waters of the high latitudes, more light will be reflected back into space, so reducing the warming of the oceans and atmosphere.

如果高纬度地区的冰原和冻结的水得到补充，更多的光将被反射回太空，从而减缓海洋和大气的变暖。

8·Scientists have also scrutinised whether it's possible to preserve the ice sheets of Greenland with reinforced high-tension cables, preventing icebergs from moving into the sea.

科学家们还仔细研究了是否有可能用加固的高压电缆来保护格陵兰岛冰原，防止冰山流入大海。

9·To have four full ice sheets is quite rare, noted Simon.

西蒙说：“一个城市有四个冰场很少见的。”

10·The ice sheets collapsed because the climate warmed quickly.

冰盖崩溃是因为气候暖化迅速。