Zimbabwe declared a state of emergency today as a cholera epidemic, caused by the collapse of sewerage and watersupplysystems, spread throughout the country.
津巴布韦因霍乱今天宣布进入紧急状态，原因是遍布全国的供水系统和污水处理系统坍塌。
2
VENT GUARD? Is a protective enclosure designed exclusively for the air release valve found in many public watersupplysystems.
通风口的保护外壳设计，专用于许多公用水供应系统中的空气释放阀。
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This paper gives a detailed account of the working principles and energy economizing hot watersupplysystems which have been successfully used in printing and dyeing mills.