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- The zircons we studied were depleted in oxygen 18 relative to the mantle, and such depletion occurs only if the crystals formed from rocks that interacted with rain or snow. 因为相较于地函，我们所研究的锆石，氧18含量偏低，而这种情形只有可能是晶体的母岩曾经和雨水或雪发生交互作用。
- Because heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18. 因为较重的同位素倾向于留下，当水从海洋表面蒸发时，余下的海洋水逐渐变得富含氧18。
- Water contains hydrogen and oxygen. 水含有氢和氧。
- Oxygen enters into many compound bodies. 氧是许多化合物的组成部分。
- She took the veil when she was 18. 她十八岁时当了修女。
- UK nationals get the vote at 18. 英国国民18岁始有选举权。
- Mars is too dry and poor in oxygen. 火星上面过于干燥，并且缺乏氧气。
- Water is composed of hydrogen and oxygen. 水由氢和氧组成。
- The law forbids the sale of alcohol to people under 18. 法律禁止向18岁以下的人出售含有酒精的饮料。
- Fish take in oxygen through their gills. 鱼通过鳃摄取氧气。
- The oxygen react vigorously with the impurity in the iron. 氧气与铁中的杂质发生剧烈的化学反应。
- The Party Congress closed victoriously on August 18. 党的代表大会在8月18日胜利结束。
- The oxygen workshop caught fire and set off a chain of explosions. 氧气车间着了火，引起了一连串的爆炸。
- At 18, he's still rather frivolous and needs to grow up. 他到了十八岁仍然很不懂事，很不成熟。
- Plants can absorb carbon dioxide and release oxygen. 植物可以吸收二氧化碳释放氧气。
- In that country, people get the vote at the age of 18. 在那个国家，人们年满十八岁获得选举权。
- Water is composed of the elements hydrogen and oxygen. 水是由氢元素和氧元素组成的。
- There was a shortage of oxygen at the top of the mountain. 山顶上缺氧。
- In some countries the legal age for voting is 18. 在一些国家里，投票选举的法定年龄为18岁。
- An organism, such as a bacterium, requiring oxygen to live. 好氧菌需要氧气生存的有机体，例如细菌
