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百不失一一百次中也不会失误一次。形容极有把握决不会出差错。例从门应庭听堂室之言,什而失九,如升堂窥室百不失一。——汉王充《论衡》英cannot possibly go wrong; not a failure out of a hundred trials; never a failure in many trials;又说“百无一失”