fixed-crest weir

例句：

1. 1. The engineers designed afixed-crest weir to control theflow of water during floods.
   工程师们设计了一个固定堰坝来控制洪水期间的水流。
2. 2. The fixed-crest weiris essential for maintaining the stability of theriverbed.
   固定堰坝对于保持河床的稳定性至关重要。
3. 3. The construction of the fixed-crest weir was completed in record time, saving valuable resources.
   固定堰坝的建设在预定时间内完成，节省了宝贵的资源。