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词汇 oxygen
释义
oxygen
noun [ U ] uk/ˈɒk.sɪ.dʒən/ us/ˈɑːk.sɪ.dʒən/ (symbol O)
B2 氧,氧气
a chemical element that is a gas with no smell or colour. Oxygen forms a large part of the air on earth, and is needed by animals and plants to live.
    更多例句
  • Air is composed mainly of nitrogen and oxygen.
  • Deep-sea divers carry cylinders of oxygen on their backs.
  • Mountain climbers use oxygen when they reach higher altitudes.
  • Plants are the main source of atmospheric oxygen.
  • The symbol for oxygen is O2.
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