城市废水管网系统中臭气的最常见的发生源主要有下水道总管道和泵站。
The most common emergence of odour comes from the Urban sewage system, mainly in the total pipelines and equipment for treatment.
圣弗朗西斯科的公共事业委员会清楚每条废水管道的精确坐标，维修记录，和出现故障的可能性。
San Francisco's Public Utilities Commission knows the exact co-ordinatesd of every waste-water pump, its maintenance history and the likelihood of it failing.
圣弗朗西斯科的公共事业委员会清楚每条废水管道的精确坐标，维修记录，和出现故障的可能性。
San Francisco's Public Utilities Commission knows the exact co-ordinatesd of every waste-water pump, its maintenance history and the likelihood of it failing.
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