| 释义 |
oxygen
oxygen /ˈɒk.sɪ.dʒən/ aep /ˈɑːk-/ noun [U] (SYMBOL O)
► B2 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.Thesaurus+: ↑Chemical elements• • • Extra Examples:» 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. |