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Jyutping joek6 si4 hyun1
Pinyin yào shi quān

Definitions (Wiktionary)
  1. noun
    keyring; keychain
    (syn.) 鑰匙扣, 鑰匙鏈, 钥匙扣, 钥匙链

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Jyutping joek6 si4 hyun1
Pinyin yào4shi quān

Definitions (CC-CANTO)
  1. a keyring; a keychain [written]