relief sewer

例句：

1. 1. The city has a network of relief sewers that help to divert stormwater away from residential areas.
   该市拥有一条条缓解下水道网络，帮助将暴雨水引导至住宅区之外。
2. 2.The sewer system is designed to relieve the pressure on the city's water supply by collecting and treating wastewater.
   下水道系统设计用来收集和处理废水，从而减轻城市供水系统的压力。
3. 3.The relief sewer was built to prevent flooding during heavy rainfall events.
   缓解下水道的建立是为了在大雨事件中防止洪水。