Most of the world's potablewater—freshwater suitable for drinking—is accounted for by groundwater, which is stored in the pores and fractures in rocks.
世界上大部分的饮用水——适合饮用的淡水——是由地下水提供的，它储存在岩石的孔隙和裂缝中。
2
Droughts can decrease the availability of potablewater and can ruin crops, making food scarce.
干旱可能减少饮用水的供应，并可以毁掉庄稼，造成食物稀缺。
3
A dab of hydrogen peroxide and a flash of ultraviolet light serve as the final sterilizing gatekeepers before the water reenters potable supplies.