Home / HSK Vocabulary / HSK 4 / 效率 效率 xiào lǜ HSK 4 · B2 Meanings efficiency Quick facts Traditional傚率 HSK LevelHSK 4 CEFRB2 ← Back to HSK 4 word list Practice 效率 with flashcards MandoBridge uses spaced repetition to help you remember HSK 4 vocabulary — free on iOS and Android.