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1·The ice sheet was assumed to have been stable.

冰盖被默认为是稳定的。

2·Now, new evidence reveals that all or most of the Antarctic ice sheet collapsed at least once during the past 1.3 million years.

现在，新的证据显示，在过去130万年中，全部的南极冰盖或其中大部分至少都崩塌过一次。

3·Unlike floating ice shelves which have little impact on sea level when they break up, the ice sheet is anchored to bedrock will blow the sea surface.

当浮动冰架破裂时，对海平面的影响很小；而与之不同的是，固定在基岩上的冰盖将会使海面炸毁。

4·As Herman Engleheart, a co-author from the California Institute of Technology says, the West Antarctic ice sheet disappear once and can disappear again.

正如加州理工学院的赫尔曼·恩格尔哈特所说，“南极西部冰盖消失过一次，也可能再次消失。”

5·Scientists agree that the key player in this scenario is the West Antarctic ice sheet, a Brazil-size mass of frozen water that is as much as 7000 feet thick.

科学家们一致认为，这一情境中的关键推手是南极西部的冰层，这是一块跟巴西（面积）差不多大小的冰原，厚达7000英尺。

6·It would take the melting of an ice sheet to do that.

但是，一个大冰原的融化就不同了。

7·This gives us an idea of how fast a large ice sheet can melt.

这告诉了我们冰原会以多快的速度融化。

8·But the Greenland ice sheet is not one solid, smooth mass of ice.

但是，格陵兰冰盖不是一个牢固光滑的冰体。

9·The satellite USES radar to measure its altitude above the ice sheet.

卫星用雷达测定卫星从冰层顶部算起的高度。

10·Greenland's massive ice sheet holds about 20 percent of the world's ice.

格陵兰巨大冰盖的冰量大约占世界的20%。