The paper discussed the source and hazards of wastewater in household, then introduced the water saving experience in developed countries.
讨论了家庭污水的来源与危害，介绍了发达国家的节水经验。
The paper discussed the source and hazards of wastewater in household, then introduced the water saving experience in developed countries.
讨论了家庭污水的来源与危害，介绍了发达国家的节水经验。
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