municipal drainage

例句：

1. 1. The city'snew subway system is expected to improvetransportation for residents.
   预计该市新的地铁系统将改善居民的交通。
2. 2. The mayorhas announced a plan to upgrade the municipalwater treatment plant.
   市长宣布了一项计划，升级市政水处理厂。
3. 3. Themunicipal government has been criticized for its handling of therecent floods.
   市政府因处理最近的洪水问题而受到批评。