No one quite knows why glaciers and ice shelves are melting so fast, or how a meltwater lake on the Greenland ice sheet covering six square kilometres could drain away in 24 hours, as it did in 2006.
没有人非常了解为什么冰架这么迅速的融化，也没人知道格林兰冰架上的一个覆盖6平方千米的融水湖会在24小时内流干——这在2006确实发生了。
The ice, much of it tens of thousands of years old, originates in the 660, 000-square-mile ice sheet covering 80 percent of Greenland.
我们所见的冰，大部分有着上万年的历史，都发源于覆盖格陵兰岛80%面积的66万平方英里冰原。
The way further south into the rest of America was through an ice-free corridor between the Rocky Mountains on the Pacific side, and the vast continental ice-sheet covering Canada on the other.
当年一道巨大的无冰走廊，一头向着通过太平洋一侧的洛基山脉一路向南延伸至美国各地，另一头深深延伸至被大陆冰层覆盖着的加拿大广袤土地。
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