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Improved sewage and water services were invaluable in preventing disease.污水处理和供水情况的改善对防止疾病无比重要。Chlorine is used in sewage treatment.氯被用于污水处理。San Diego is asking private companies to bid against city workers to run one of the city's three water treatment plants.圣迭戈要求私人公司投标，与市政人员争夺该市三大污水处理厂之一的经营权。A filter used in sewage disposal sloughs.污水处理装置的过滤器会结上硬垢而脱落。The smell is believed to have originated from the sewage works.气味据说来自污水处理厂。Some cities in the world do not have proper facilities for the disposal of sewage.世界上的某些城市没有合理的污水处理设施。The city is upgrading the sewage treatment plant.这个城市正在改造污水处理厂。The sewage plant processes waste.污水处理厂对废水进行处理。 |