Nationwide, China's available water supply per person is one-fourth the world average.
中国全国的人均可用水供应量仅为世界平均水平的四分之一。
In some countries the supply of water from underground can be the only source of water available.
在一些国家由地下水供给的水是仅有的可用水源。
In some countries the supply of water from underground can be the only source of water available.
在一些国家由地下水供给的水是仅有的可用水源。
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