sewer system

例句：

1. 1. The city has amodern sewer system that efficiently handlesits wastewater.
   这个城市有一个现代化的下水道系统，能够高效地处理其废水。
2. 2. The construction of the new sewersystem is expected to improve the quality oflife in the area.
   新下水道系统的建设预计将提高该地区的生活品质。
3. 3. Thesewer system was designedto prevent flooding during heavy rainfallevents.
   下水道系统被设计成在大雨事件中防止洪水。