一个自动防故障装置的后备系统确保了可靠的运转，即时在主要电路产生了故障。
A fail-safe backup system ensures reliable operation, even if a fault develops in the main circuit.
有说服力的词汇：保障、安全、担保、可靠、广受欢迎、已经测试、自动防故障、经过验证。
Power words, that work well include: security, safety, guaranteed, reliable, popular, tried and tested, fail-safe, proven.
一个传感器出现电子故障，可能会导致两个传感器之间电压发生变化，从而启动自动防故障模式，限制汽车车速。
An electronic fault affecting one sensor would cause a variation in voltage between the two, triggering a fail-safe mode that limits the vehicle's speed.
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