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 Overview Practice 效率 with flashcards MandoBridge uses spaced repetition to help you remember HSK 4 vocabulary — free on iOS and Android. ← All HSK 4 vocabulary