Water,oneofman’smostpreciousresources,ranteduntilitsuseisthreatenedbyreducedavailability(可用性),,physical,,qualityandusefulnessofwater,:①preservationofriversintheirnaturalstate;②potability(饮用)ofthewatersupply;③preservationandenhancementoffishandwildlife;④safetyforagriculturaluse;⑤safetyforrecreational(娱乐的)useincludingswimming;⑥modation(适应;供应)toagreatvarietyofindustrialpurpose;⑦freedomfromnuisance(有害的东西);⑧generationofpowerforpublicutilities(公用事业);⑨dilution(稀释),biological,andphysicalrequirementsforthemultitudeofusesnotedabove,thereareconstraints(约束、限制)reflectingpublichealthrequirements,aesthetics(美学),economics,andshortandlong-,thereisnorigid(严格的)orspecificdefinitionofwaterpollution,,liquidandsolidconstituentsofwaterthatconstitutepollutiondependsontheintend
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