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TOEFL IELTS BNC: 5200 COCA: 5103
hydrogen
/ˈhaɪdrədʒən ||; ˈhaɪdrədʒən/noun [U] (symbol H) a light colourless gas. Hydrogen and another gas (oxygen) form water (H₂O). 氢;氢气
TOEFL IELTS BNC: 5200 COCA: 5103
hydrogen/ˋhaIdrədʒən; ˈhaIdrədʒ$n/ n [U] a gas that is lighter than air and that combines with oxygen to form water 氢﹔氢气
TOEFL IELTS BNC: 5200 COCA: 5103
hydrogen noun (no plural)a light gas that you cannot see or smell: Water is made of hydrogen and oxygen.

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