Home HSK Vocabulary HSK 3 信封 信封 xìn fēng HSK 3 · B1 Meanings envelope Quick facts HSK LevelHSK 3 CEFRB1 ← Back to HSK 3 Overview Practice 信封 with flashcards MandoBridge uses spaced repetition to help you remember HSK 3 vocabulary — free on iOS and Android. ← All HSK 3 vocabulary