除非 chú fēi — only if (...
chú (second tone, rising) fēi (first tone, high and level)chu2 fei1
only if (...
HSK 5· HSK 1–6 (classic)Level 5· 2021 three-band, nine-level proficiency standardconjunction
Meanings
only if (...
only if (...; or otherwise; ...); only when; only in the case that; unless
conjunction