单词：downflow weir
downflow weir的用法和样例：
例句
- It has novel seal structure and adjustable overflow weir plate.其新颖的密封结构，可调式溢流堰板。
- A hydraulic model was developed to analyze the unsteady flow of a water supply system with long pipelines and an overflow weir.在长距离输水管路出口设置溢流堰可以有效控制水击和防止管路脱空。
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