Spreading wastewater over fields, and allowing it to leach back through the soil into local waterways, turns out to be a reasonable way to purify it.
将废水浇灌到田里，这些水经过土壤的过滤后又重新流回当地的水系，这已经被证明是非常合理的污水净化方法。
Spreading wastewater over fields, and allowing it to leach back through the soil into local waterways, turns out to be a reasonable way to purify it.
将废水浇灌到田里，这些水经过土壤的过滤后又重新流回当地的水系，这已经被证明是非常合理的污水净化方法。
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