排水系统

例句：

1. 1. The city has a sophisticated drainage system to manage its stormwater.
   这个城市有一个复杂的排水系统来管理它的暴雨水。
2. 2. The sewage system is responsible for removing pollutants from the city's wastewater.
   污水系统负责从城市的废水中去除污染物。
3. 3.The water treatment plant filters the raw water before it can be used for irrigation.
   水处理厂在将水用于灌溉之前会过滤原始水。