practical weir

例句：

1. 1.The practical weir was designed to prevent flooding during heavy rains.
   实用的堤坝设计用来防止大雨时的洪水。
2. 2. The engineers had to modify the original design of the practical weir to accommodate the new requirements.
   工程师们不得不修改原始的实用堤坝设计以满足新的需求。
3. 3. The practical weir is an essential component of the flood control system in this region.
   实用的堤坝是该地区防洪系统的一个关键组成部分。