除非

除非 [chú fēi]

1. ■ （表示唯一的条件） only if; only when:

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.

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常用词组

1. ■ （表示不计算在内， 相当于“除了”） unless:

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.