waste supply canal

例句：

1. 1. The city has a wastewater treatment plant that supplies water to the nearby towns.
   这个城市有一个废水处理厂，为附近的城镇供水。
2. 2. The wastewater from the factory needs to be treated before it can be discharged into the river.
   工厂产生的废水需要经过处理才能排放到河流中。
3. 3. The wastewater conveyance system is essential for maintaining the cleanliness of the city's streets and parks.
   废水输送系统对于保持城市街道和公园的清洁至关重要。