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Jyutping baak6 hoi1 seoi2
Pinyin bái kāi shuǐ

Definitions (CC-CEDICT)
  1. plain boiled water
Definitions (Wiktionary)
  1. noun
    plain boiled water
    (syn.) 白水
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Definitions (兩岸三地生活差異詞語彙編—Two Shores Three Places)
  1. 飲料:臺
    白開水、冷開水
  2. 飲料:陸
    涼白開