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TOEFL BNC: 3719 COCA: 3839

oxygen

Word family
Related topics: Elements
ox·y·gen /ˈɒksɪdʒən $ ˈɑːk-/ ●●○ noun [uncountableU]  
HCEa gas that has no colour or smell, is present in air, and is necessary for most animals and plants to live. It is a chemical element: symbol O 氧〔一种化学元素,符号为O
Examples from the Corpus
Origin oxygen
(1700-1800) French oxygène, from Greek oxys sharp, acid + French -gène forming; because it was believed that oxygen forms part of all acids
ox·y·gen noun
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