seweragen.排水设备;污水
sewerage-treatment污水处理
sewerage infrastructure污水系统基础建设
sewerage treatment plant污水处理厂
sewerage disposing plant污水处理厂
sewerage polluting source污染源
Sewerage Planning Division下水道计画课
sewerage of separate system分流制下水道
sewerage first-aid measure污水收集应急措施
sewerage improvement programme排污设备改善计划
Sewerage Construction Division下水道建设课