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1. Oxford American Dictionary

   fail-safe

   • IPA[ˈfāl ˌsāf]

   美式

   • adj.
     causing a piece of machinery or other mechanism to revert to a safe condition in the event of a breakdown or malfunction；unlikely or unable to fail
   • n.
     a system or plan that comes into operation in the event of something going wrong or that is there to prevent such an occurrence

   • noun: fail-safe, plural noun: fail-safes

2. • 釋義

   adj.

   形容詞

   • 1. causing a piece of machinery or other mechanism to revert to a safe condition in the event of a breakdown or malfunction a forklift with a fail-safe device
   • ▪ unlikely or unable to fail the computer that runs the place is supposed to be fail-safe

   n.

   名詞

   • 1. a system or plan that comes into operation in the event of something going wrong or that is there to prevent such an occurrence the secondary safety system is indeed a fail-safe