open center valve

例句：

1. 1.The engineer opened the center valve to releasethe pressure.
   工程师打开了中心阀门来释放压力。
2. 2. The valve was closed, and weneeded to open it to continue the process.
   阀门关闭了，我们需要打开它继续这个过程。
3. 3. The technician carefully opened the center valveto ensure proper flow.
   技术员小心地打开了中心阀门，以确保正确的流动。