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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. 因為相較于地函，我們所研究的鋯石，氧18含量偏低，而這種情形只有可能是晶體的母巖曾經(jīng)和雨水或雪發(fā)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. 因為較重的同位素傾向于留下，當水從海洋表面蒸發(fā)時(shí)，余下的海洋水逐漸變得富含氧18。
- Water contains hydrogen and oxygen. 水含有氫和氧。
- Oxygen enters into many compound bodies. 氧是許多化合物的組成部分。
- She took the veil when she was 18. 她十八歲時(shí)當了修女。
- UK nationals get the vote at 18. 英國國民18歲始有選舉權。
- Mars is too dry and poor in oxygen. 火星上面過(guò)于干燥，并且缺乏氧氣。
- Water is composed of hydrogen and oxygen. 水由氫和氧組成。
- The law forbids the sale of alcohol to people under 18. 法律禁止向18歲以下的人出售含有酒精的飲料。
- Fish take in oxygen through their gills. 魚(yú)通過(guò)鰓攝取氧氣。
- The oxygen react vigorously with the impurity in the iron. 氧氣與鐵中的雜質(zhì)發(fā)生劇烈的化學(xué)反應。
- The Party Congress closed victoriously on August 18. 黨的代表大會(huì )在8月18日勝利結束。
- The oxygen workshop caught fire and set off a chain of explosions. 氧氣車(chē)間著(zhù)了火，引起了一連串的爆炸。
- At 18, he's still rather frivolous and needs to grow up. 他到了十八歲仍然很不懂事，很不成熟。
- Plants can absorb carbon dioxide and release oxygen. 植物可以吸收二氧化碳釋放氧氣。
- In that country, people get the vote at the age of 18. 在那個(gè)國家，人們年滿(mǎn)十八歲獲得選舉權。
- Water is composed of the elements hydrogen and oxygen. 水是由氫元素和氧元素組成的。
- There was a shortage of oxygen at the top of the mountain. 山頂上缺氧。
- In some countries the legal age for voting is 18. 在一些國家里，投票選舉的法定年齡為18歲。
- An organism, such as a bacterium, requiring oxygen to live. 好氧菌需要氧氣生存的有機體，例如細菌
