每年我们要消耗25立方公里的地下水。
超级火山将会包括那些会释放1000立方公里材料的火山爆发。
Such "supervolcanoes" would include eruptions that release more than 1000 cubic kilometres of material.
所以，我们正在谈论的也许是大约合计一百(或五十)万立方公里的冰。
So we're talking about maybe a (half) million cubic kilometers of ice in total.
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