spillway gate

例句：

1. 1. The spillway gate is designedto prevent water from flowing over thedam during heavy rainfall.
   溢流堰门设计用来在大雨时防止水溢出大坝。
2. 2. The spillway gate was closeddue to a sudden drop in water levels.
   由于水位突然下降，溢流堰门被关闭了。
3. 3. The spillway gateis essential for maintaining the stability of thedam.
   溢流堰门对于保持大坝的稳定性至关重要。