drainage divide

例句：

1. 1. The drainage divideis crucial for the proper functioning ofthe city's sewer system.
   排水分界线对于城市下水道系统的正常运行至关重要。
2. 2. The construction of the drainage divide hasbeen a long-standing issue in thisregion.
   排水分界线的建设一直是该地区长期存在的问题。
3. 3. The engineers carefully planned thedrainage divide to ensure efficient drainage and preventflooding.
   工程师们仔细规划了排水分界线，以确保排水高效且防止洪水。