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TOEFL BNC: 3719 COCA: 3839

oxygen

oxygen /ˈɑːksɪʤən/ noun
oxygen
/ˈɑːksɪʤən/
noun
Learner's definition of OXYGEN
[noncount]
: a chemical that is found in the air, that has no color, taste, or smell, and that is necessary for life氧;氧气
often used before another noun常用于另一名词前

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