他们已经知道，由于高温，1956年起附近的穆鲁拉塔山（Mururata）冰川表面积已经消失了超过20%，体积的百分比则可能更大。

They already know that the nearby glacier of Mururata has lost more than 20% of its surface area since 1956 due to higher temperatures, and probably a greater percentage of its volume.

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定义：与物体相同体积的球体的表面积和物体的表面积和比。

Sphericity:Ratio of the surface area of sphere having the same volume as the particle to the area of the particle.

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