Home / HSK Vocabulary / HSK 5 / 原理 原理 yuán lǐ HSK 5 · C1 Meanings principle theory Quick facts HSK LevelHSK 5 CEFRC1 ← Back to HSK 5 word list Practice 原理 with flashcards MandoBridge uses spaced repetition to help you remember HSK 5 vocabulary — free on iOS and Android.