oxygen
柯林斯词典
1. N-UNCOUNT Oxygen is a colourless gas that exists in large quantities in the air. All plants and animals need oxygen in order to live. 氧气
The human brain needs to be without oxygen for only four minutes before permanent damage occurs. 人脑缺氧只需4分钟就会造成永久性损伤。
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oxygen /ˈɒksɪdʒən/
剑桥词典
- 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 .
- 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. 返回 oxygen
氧，氧气
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