fail-safe

n.自动防故障装置

faculty, fad, faddiness, faddish, faddy, fade, fade-in, fade-out, faded, faecal (US fecal), faeces (US feces), fag, fag-end, faggot (US fagot), fah, Fahrenheit, faience, fail, fail in, fail to, failing, failure, faint, faint-hearted, faint-heartedly, faint-heartedness, fainthearted, faintly, faintness, fair, fair copy, fair play, fair-haired, fair-minded, fair-to-middling, fair-weather friend, fairground, fairly, fairness, fairway,