凡质量不合格的产品均须退回。 — Chinese Grammar HSK 6 flashcard
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凡质量不合格的产品均须退回。
All unqualified products must be returned.
fán zhíliàng bùhégé de chǎnpǐn jūn xū tùihúi 。
Expressing "as long as" with "fanshi"
凡(是) + Noun + 无不 / 均 + Predicate