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hydrogen noun

  /ˈhaɪdɹədʒ(ə)n/ , /ˈhaɪdɹəd͡ʒən/ , [ˈhaɪd͡ʒɹəd͡ʒən]
  • The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794.
  • A molecule of this molecular species
水素
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