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Jyutping tin1 haa6 mou4 soeng1
Pinyin tiān xià wú shuāng

Definitions (CC-CANTO)
  1. only one in the world
Definitions (Wiktionary)
  1. phrase, idiomatic
    unique; unparalleled; singular
    (syn.) 舉世無雙, 举世无双
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)