separate cut-off valve

例句：

1. 1. The engineer designed a separate cut-off valve to prevent the leakage of oil.
   工程师设计了一个分离切断阀以防止油的泄漏。
2. 2. The new model of the car has a separate cut-off valve that can be easily opened and closed.
   这款汽车的新型号有一个可以轻易打开和关闭的分离切断阀。
3. 3.During the maintenance, the technician replaced the old separate cut-off valve with a new one.
   在维护过程中，技术人员用一个新的替换了旧的分离切断阀。