Home HSK Vocabulary HSK 7–9 高空 高空 gāo kōng HSK 7–9 · C2 Meanings high altitude Quick facts HSK LevelHSK 7–9 CEFRC2 ← Back to HSK 7–9 Overview Practice 高空 with flashcards MandoBridge uses spaced repetition to help you remember HSK 7–9 vocabulary — free on iOS and Android. ← All HSK 7–9 vocabulary