但是，格陵兰冰盖不是一个牢固光滑的冰体。
But the Greenland ice sheet is not one solid, smooth mass of ice.
这表明在低应力区，冰体流动更接近牛顿流体。
We assume that the glacier ice is a Newton fluid in the low stress region.
组成它们的物质也不一样，冰体在它们的质量里占的比重更多。
And they're made of different stuff, with ices comprising more of their mass.
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