open drain

例句：

1. 1. The city has been working on improving its open drain system.
   该市一直在努力改善其开放式排水系统。
2. 2.The storm caused significant damage to the open drains in the area.
   暴风雨对该地区的开放式排水沟造成了重大损害。
3. 3. The engineer designed a new system to prevent water from flowing into the open drains.
   工程师设计了一个新的系统，以防止水流入开放式排水沟。