The only way I have found to recover from this is to either log into the machine via the serial port and kill off the lock program, or hard-reboot the machine.

我发现，要解决此问题，只能通过串口登录到机器，然后杀死锁程序，或者强行重新引导机器。

youdao

It's a bit more-- to continue with the metaphor of the on-of switch-- as though not only is the switch turned to off, there's a lock on the switch.

要继续用开关的比喻-,就有点奇怪了-,似乎开关的上面，还有一个锁定装置。

耶鲁公开课 - 死亡课程节选

To that end, it has more system controls than the existing Facebook app, with permission to turn off the lock screen, start up when the phone boots and control your WiFi connection, among others.

ENGADGET

He said when they shut the lights off and lock the door at the Hall of Fame at night, all the busts in the Hall talk to each other.

WSJ: On Second Try, Bill Parcells Earns a Trip to Canton for the Pro Football Hall of Fame

The dimpled plastic back, similar to that on the Galaxy Nexus -- has a wrap-around illusion and can only be pried off by turning the lock at its base.

ENGADGET: Samsung Galaxy Xcover 2 hands-on: a ruggedized smartphone with Android Jelly Bean onboard (video)