flat-topped weir

例句：

1. 1. The flat-topped weir is designed to control the flow of water during floods.
   这个平顶堰坝设计用来在洪水期间控制水流。
2. 2. The engineers were tasked with building a flat-topped weir to divert the river.
   工程师们被指派建造一个平顶堰坝来引导河流。
3. 3. The flat-topped weir was a crucial component in maintaining the river's health.
   这个平顶堰坝是维护河流健康的关键部件。