pneumatic signal

例句：

1. 1.The air-operated switch is easy to use.
   这个气动开关很容易使用。
2. 2.The pneumatic signal system is reliable and efficient.
   气动信号系统是可靠且高效的。
3. 3.The pneumatic valve is designed for high pressure applications.
   气动阀门是为高压应用设计的。