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3.urban sewerage system
4.irrigation and drainage system
5.interior water-supply and plumbing system
6.highway subgrade drainage system
7.The drainage system has been aged.
排水系统已经老化了。收藏指正
8.Design for the Drainage System of Addis Ababa Ring-road Project
亚的斯亚贝巴市环城道路排水系统设计收藏指正
9.The defect in the drainage must be remedied.
排水系统的缺陷该设法补救。收藏指正
10.The drainage of the town is not good, some of the pipes are broken.
城里的排水系统不好,有些水管断裂了。收藏指正
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