一旦某一地区对水力资源的需要量超过水利资源的供应量，人们就得为使用水利资源支付等价物。
When more water power is wanted in a particular district, than there are falls of water to supply it, persons will give an equivalent for the use of a fall of water.
一旦某一地区对水力资源的需要量超过水利资源的供应量，人们就得为使用水利资源支付等价物。
When more water power is wanted in a particular district, than there are falls of water to supply it, persons will give an equivalent for the use of a fall of water.
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