double valves

例句：

1. 1.The double valves in the engine are responsible for controlling air flow.
   发动机中的双阀门负责控制空气流动。
2. 2. The double valves on the brake system are designed to prevent overheating.
   制动系统中的双阀门设计用来防止过热。
3. 3. The double valves were replaced after a major repair job was completed.
   在一次重大维修工作完成后，更换了双阀门。