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Unit 13

  Text：Water Treatment Processes

One of the great achievements of modern technology has been to drastically reduce the incidence of waterborne of diseases such as cholera and typhoid fever. 当代化技术所取得伟大成就之一就是极大降低了霍乱和伤寒等水源性疾病发生。These diseases are no longer the great risks to pubic health that they once were. 这些疾病曾经对人类健康产生过巨大威胁，但现在不是了。The key to this advance was the recognition that contamination of pubic ware, supplies by human wastes was the main source of infection，and that it could b ...

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