ratchet relay

例句：

1. 1. The new relay is a more reliable option than the old one.
   新的继电器比旧的更可靠。
2. 2. In this circuit, the relay operates by releasing a spring when it senses an electrical signal.
   在这个电路中，继电器通过感应电信号释放弹簧来工作。
3. 3. The relay switch controls the flow of electricity in the circuit.
   继电器开关控制电路中的电流流动。