名詞 fail-safe:

1. a mechanism capable of returning to a safe state in case there is a failure or malfunction

形容詞 fail-safe:

1. guaranteed not to fail
2. eliminating danger by compensating automatically for a failure or malfunction

fail-safe

adj.（形容詞）
Capable of compensating automatically and safely for a failure, as of a mechanism or power source.
故障自動保險的：當機械裝置或電源出現(xiàn)故障時，能自動和安全提供保障的
Acting to discontinue a military attack on the occurrence of any of a variety of predetermined conditions.
能阻止軍事攻擊的：預定情況發(fā)生時能終止軍事攻擊行為的
Guaranteed not to fail:
萬無一失的：
例句：
.There is no fail-safe mechanism guaranteed either to contain or to restore presidential authority.(Arthur M. Schlesinger, Jr.)
.沒有一個萬無一失的處理方法可以保證抑制或恢復總統(tǒng)的權(quán)力.(小阿瑟M.施萊辛格)

n.（名詞）
A fail-safe mechanism.
自動保險裝置
v.intr.（不及物動詞）
fail-.safed,fail-.saf.ing,fail-.safes
To compensate automatically for failure.
自動抵消故障