Home / HSK Vocabulary / HSK 7–9 / 纽扣 纽扣 niǔ kòu HSK 7–9 · C2 Meanings button Quick facts Traditional紐釦 HSK LevelHSK 7–9 CEFRC2 ← Back to HSK 7–9 word list Practice 纽扣 with flashcards MandoBridge uses spaced repetition to help you remember HSK 7–9 vocabulary — free on iOS and Android.