In most cities there was still a complete lack of even a basic sewage system.
大多数的城市仍然连基本的污水处理系统都没有。
Sewage water treatment system has advanced and separate rain water and sewage systems.
污水处理系统，采用先进的雨污分流管网。
The facility should have a septic system or discharge permit to dispose of sewage.
为处理生活污水，受核工厂须设有生活污水处理系统或领有排污许可证。
Thus, he research and development of the sewage flow measurement system have great significance.
因此，进行污水流量测量方面的研究和开发有着十分重要的意义。
Thus, he research and development of the sewage flow measurement system have great significance.
因此，进行污水流量测量方面的研究和开发有着十分重要的意义。
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