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Jyutping ngai5 syun1
Pinyin yǐ suān

Definitions (CC-CEDICT)
  1. formic acid
Definitions (Wiktionary)
  1. noun
    formic acid
    (syn.) 甲酸
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)