Fail-safe
(重定向自Failsafe)
A fail-safe device is one that, in the event of a specific type of failure, responds in a way that will cause no harm, or at least a minimum of harm, to other devices or to personnel.
Fail-safe and fail-secure are similar but distinct concepts. Fail-safe means that a device will not endanger lives or property when it fails. Fail-secure means that access or data will not fall into the wrong hands in a failure. Sometimes the approaches suggest opposite solutions. For example, if a building catches fire, fail-safe systems would unlock doors to ensure quick escape and allow firefighters inside, while fail-secure would lock doors to prevent unauthorized access to the building.