bottom sector gate

例句：

1. 1. The bottom sector gate is responsible for controlling the flow of water through the system.
   底部扇区门负责控制水流过系统。
2. 2. The engineer designed a new bottom sector gate to improve efficiency.
   工程师设计了一种新的底部扇区门以提高效率。
3. 3. The bottom sector gate was installed to prevent water from flowing backwards into the main pipe.
   底部扇区门被安装来防止水反向流入主管道。