lock-in relay

例句：

1. 1. The lock-in relay is essential for maintaining the stability of the communication system.
   锁定式中继器对于保持通信系统的稳定性至关重要。
2. 2. The lock-in relay was designed to prevent interference during transmission.
   锁定式中继器被设计用来防止传输过程中的干扰。
3. 3. The lock-in relay is used to amplify signals and improve signal quality.
   锁定式中继器用于放大信号并提高信号质量。