The selection of the disposal methods of municipal sewage and the way of seperation of the old combined sewerage system need to be discussed and studied.
城市废水出路的安排和合流制沟道系统的分流化是两个需要深入研究的课题。
The selection of the disposal methods of municipal sewage and the way of seperation of the old combined sewerage system need to be discussed and studied.
城市废水出路的安排和合流制沟道系统的分流化是两个需要深入研究的课题。
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