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。
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。
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