turn-off valve

例句：

1. 1.The turn-off valve on the water supply system needs to be replaced immediately.
   供水系统的断流阀需要立即更换。
2. 2.The engineer found a faulty turn-off valve and fixed it immediately.
   工程师发现一个断流阀的故障并立即修复了它。
3. 3.The firefighters used a special tool to turn off the main valve, preventing further damage.
   消防员使用特殊工具关闭主断流阀，防止进一步损害。