求翻译：不仅如此，水资源在全国范围的分布严重不均。占全国面积三分之一的长江以南地区拥有全国五分之四的水量，而面积广大的北方地区只拥有不足五分之一的水量，其中西北内陆的水资源量仅占全国的4.6％。是什么意思？

Moreover, the severe uneven distribution of water resources across the country. Accounted for one-third of the total land area of ​​the Yangtze River area south of the country four-fifths of the amount of water, a vast area of ​​the northern region has less than one fifth the amount of water, includ

Not only that, the water resources in the distributed throughout the country are not serious. Of the total area is one of 3 sub-regions of the south of the Yangtze River with a nationwide 4 5 the amount of water, and the vast area of northern areas have only one of less than 5 minutes in the amoun

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