英语翻译地球的淡水资源仅占其总水量的2.5%,而在这极少的淡水资源中,又有70%以上被冻结在南极和北极的冰盖中,加上难以

The fresh water takes up 2。5% of the world's water source, of this strictly limited supply, 70% are being permanently frozen under the crust of the Arctic and Anarctic, additionaly, of those snow retention on mountains and glaciers, 87% are difficult to be utilized。

The potable water supply that we(human) can really put in use are portions of rivers, lakes and groundwater, which account for 0。26% of the total water source of the earth。