fail-safe (also failsafe)

• 1. 

  ADJ Something that is fail-safe is designed or made in such a way that nothing dangerous can happen if a part of it goes wrong. 有故障保险功能的; 有自动防障功能的 [usu ADJ n]

  例：

  The camera has a built-in failsafe device which prevents it from working if the right signals aren't received.

  这部照相机内部有故障保险装置，可以令照相机在未接收到正确信号时无法运行。