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Jyutping man4 leon6
Pinyin wén lùn

Definitions (Wiktionary)
  1. noun, literary
    articles and works; writings
    (syn.) 书论, 書論
  2. noun
    literary theory (chiefly of premodern China)
    (syn.) 文藝理論, 文艺理论
  3. noun
    writings on literary theory