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TOEFL IELTS BNC: 5200 COCA: 5103
hydrogen
hdrədʒən ˈhaɪdrədʒən
N-UNCOUNT ;氢气 Hydrogen is a colourless gas that is the lightest and commonest element in the universe. ;氢气
Trends of hydrogen
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TOEFL IELTS BNC: 5200 COCA: 5103
TOEFL IELTS BNC: 5200 COCA: 5103
TOEFL IELTS BNC: 5200 COCA: 5103
hydrogen
Gases: acetylene, ammonia, argon...

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