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Jyutping leot6 si1 seon3
Pinyin lǜ shī xìn

Definitions (粵典–words.hk)
  1. 名詞
    由律師​或律​師樓​發​出​嘅​信件​,​通常​係​通知​對方關​於​一​啲​法律​程序​嘅​嘢​(​量​詞​:​封​)
    letter from lawyer or law firm
Definitions (Wiktionary)
  1. noun
    legal letter; demand letter (Classifier: 封 m c)
    (syn.) 律师函, 律師函