flat-crested weir

例句：

1. 1.The flat-crested weir is a critical component in flood control.
   平顶堰是防洪控制的关键组成部分。
2. 2. The engineers designed the flat-crested weir to divert the water away from the city center.
   工程师们设计了平顶堰，将水引向市中心之外。
3. 3. The flat-crested weir was constructed to prevent flooding during heavy rainfall.
   平顶堰被建造出来以防止大雨时洪水泛滥。