即使管道供水系统在水源处是安全的。
即使管道供水系统在水源处安全的，等水到达龙头时就不一定总是安全的了。
Even if a piped water supply is safe at its source, it is not always safe by the time it reaches the tap.
PPWSA的Chea Visoth回忆说当初供水到他的公寓的管道就是从路边公共供水系统的储水槽中引出来的。
Chea Visoth of the PPWSA recalls carrying water up to his flat from a roadside tank filled by a pipe illegally tapping the public system.
供水系统间歇式供水方式会造成主管道内部产生负压，高位水池(水库)供水管道很长时也容易产生负压。
The intermittent supply mode in water supply system will lead to negative pressure in the main pipe, and the same phenomenon also exists in long downcomers of elevated basin (reservoir).
随着我国市政基础建设的迅猛发展，供水系统中的室外给水管道在整个系统中占据了重要地位。
With China's rapid development of municipal infrastructure, the outdoor water supply pipe of water supply system occupies an important position in the whole system.
随着我国市政基础建设的迅猛发展，供水系统中的室外给水管道在整个系统中占据了重要地位。
With China's rapid development of municipal infrastructure, the outdoor water supply pipe of water supply system occupies an important position in the whole system.
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