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Jyutping oi2 syun1
Pinyin ài suān

Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

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Jyutping oi2 syun1
Pinyin ǎi suān

Definitions (CC-CEDICT)
  1. sour belching (medical term)
Definitions (Wiktionary)
  1. verb
    to have acid reflux
    (syn.) 反酸