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Jyutping gwok3 gaa1 bei3 mat6
Pinyin guó jiā mì mì

Definitions (Wiktionary)
  1. noun
    state secret
    (syn.) 国家机密, 國家機密
Examples (Wiktionary)
  1. Mandarin
    掌握国家秘密
    掌握國家秘密
    zhǎng wò guó jiā mì mì
    • to hold state secrets