求翻译：目前地球上水总储量约为1.36x1018m3，其中淡水只占2.5%。这2.5%中有2.2%是难以取得的冰川和深层地下水，河流和湖泊中的淡水仅占世界总淡水的0.3%。是什么意思？

Earth Sheung Shui total reserves of about 1.36x1018m3, fresh water only accounts for 2.5%. 2.5% 2.2% 0.3% of the fresh water in glaciers and deep groundwater, rivers and lakes is difficult to obtain only the world's total freshwater.

Total water present on earth for reserves of about 1.36 X 1018 M 3, which accounted for only 2.5 % fresh water. In the 2.5 % it is difficult to achieve 2.2 % of the glaciers and deep groundwater, rivers and lakes of the world's freshwater is only 0.3 % of the total fresh water.

At present the Earth sails upstream the ultimate reserves is approximately 1.36x1018m3, in which fresh water only accounts for 2.5%.This in 2.5% has the glacier and in-depth ground water which 2.2% are obtains with difficulty, in the rivers and the lake fresh water only occupies the world total fres

Planet total reserves of about 1.36x1018m3 in Sheung Shui, fresh water only accounts for 2.5%. 2.2% is difficult to achieve in this 2.5% glacier and deep groundwater, freshwater rivers and Lakes is only 0.3% per cent of total world fresh water.

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