burn-out relay

例句：

1. 1. The old relay was a bit worn out and needed to be replaced.
   这个旧继电器有点磨损，需要更换。
2. 2. The engineer tested the new relay before installing it in the circuit.
   工程师在安装电路前测试了新的继电器。
3. 3. The relay failed to operate properly, causing the entire system to shut down.
   继电器无法正常工作，导致整个系统停机。