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Jyutping jat1 fan1 suk6
Pinyin yī fēn shú

Definitions (Wiktionary)
  1. adj, of cooking
    rare
    (syn.) 一成熟

一分熟 [---]

Jyutping
Pinyin yī fēn shú

Definitions (CC-CEDICT)
  1. rare (of steak)