selsyn device

例句：

1. 1. The selsyn device is used to filter out unwanted signals.
   选择性装置用于过滤掉不需要的信号。
2. 2. In the field of electronics, selsyn devices are widely used for signal processing.
   在电子领域，选择性装置被广泛用于信号处理。
3. 3.The selsyn device has greatly improved the efficiency of our communication system.
   选择性装置大大提高了我们通信系统的效率。