lock circuit

例句：

1. 1. The engineer had to lock the circuit before starting the machine.
   工程师在启动机器前必须锁住电路。
2. 2. The security system is designed to lock the circuit when someone tries to enter.
   安全系统设计为当有人试图进入时锁定电路。
3. 3. The technician quickly locked the circuit and turned off the power switch.
   技术员迅速锁定电路并关闭电源开关。