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Jyutping hei3 seoi2
Pinyin qì shuǐ

Definitions (Wiktionary)
  1. noun
    carbonated beverage
Examples (Wiktionary)
  1. Mandarin
    “你居然买了什么氢气水?那不是智商税是什么?”
    “你居然買了什麼氫氣水?那不是智商税是什麼?”
    “ nǐ jū rán mǎi le shén me qīng qì shuǐ ? nà bù shì zhì shāng shuì shì shén me ? ”
    • "You actually bought those 'hydrogen-infused water'? If that's not a scam what else could be?"