Home / HSK Vocabulary / HSK 7–9 / 信件 信件 xìn jiàn HSK 7–9 · C2 Meanings letter (sent by mail) Quick facts HSK LevelHSK 7–9 CEFRC2 ← Back to HSK 7–9 word list Practice 信件 with flashcards MandoBridge uses spaced repetition to help you remember HSK 7–9 vocabulary — free on iOS and Android.