Water should be regularly chlorinated in public swimming baths to keep it pure.
公共游泳池的水应定期用氯气消,持干净。
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That's why the Environmental Protection Agency in the United States considers evidence from outbreaks in European countries to put together national preventative measures like chlorinating water supplies and monitoring them for parasites.
这就是为什么美国环境保护署(Environmental Protection Agency)考虑欧洲国家暴发疫情的证据,制定国家预防措施,比如对供水系统进行氯化处理,并对其进行寄生虫监测。