separate drainage system

例句：

1. 1. The new buildinghas a separate drainage system for the parking lot.
   这座新建筑为停车场配备了独立的排水系统。
2. 2. The construction of the new highway required a separate drainage system to prevent flooding.
   新建高速公路的建设需要一套独立的排水系统以防止洪水。
3. 3. The city government is working on a separate drainage system to improve water quality in the river.
   市政府正在努力实施一套独立的排水系统，以改善河流的水质。