run-off tab

例句：

1. 1.The plumber replaced the old run-off tab with a new one.
   水管工用一个新的替换了旧的排水口盖。
2. 2.The engineer designed a special run-off tab to prevent water from leaking.
   工程师设计了一个特殊的排水口盖以防止水泄漏。
3. 3.The construction crew installed the run-off tab before starting work on the new building.
   建筑工人在开始建造新大楼之前安装了排水口盖。