HSK 6
除非
chúfēi连
only if (..., or otherwise, ...); only when; only in the case that; unless
除非下大雨否则活动照常。
Chú fēi xià dà yǔ fǒu zé huó dòng zhào cháng.
The event will proceed as usual unless it rains heavily.
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New in the HSK 3.0 word list at level 6.