Zimbabwe declared a state of emergency today as a cholera epidemic, caused by the collapse of sewerage and water supply systems, 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。

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VENT GUARD? Is a protective enclosure designed exclusively for the air release valve found in many public water supply systems.

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 water supply systems which have been successfully used in printing and dyeing mills.

本文介绍了已成功地应用于印染厂的大型、全自动集中热水供应系统的工作原理、节能效果及技术措施。

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It is spread through infected faeces and, once it enters the water supply, it is difficult to stop - especially in a country like Haiti which has almost no effective sewage disposal systems.

BBC: UN launches appeal to fight Haiti cholera epidemic