[ chúfēi ] 1.(表示唯一的条件) only if; only when 短语和例子 除非在这里修个水库, 才能解决灌溉问题。 only when a reservoir is built here can we solve our irrigation problem. 若要人不知, 除非己莫为。 if you don't want people to know, you'd better not do it.2.(表示不计算在内, 相当于“除了”) unless 短语和例子 除非另有费率 not otherwise rated; 除非另有规定 not otherwise provided; not elsewhere specified; 除非另有列举 not otherwise enumerated; 除非提早开始装卸 unless commenced earlier; 除非我打电话给你, 否则你不要来。 don't come unless i ring you up. 他不会不来, 除非他病了。 he'll certainly come unless he is ill