碳的化合价是4价。
CO is the formula for carbon monoxide.
CO是一氧化碳的分子式。
Humans take in oxygen and breathe out carbon dioxide.
人吸入氧气，呼出二氧化碳。
Diamond is the crystalline form of the element carbon.
钻石是碳元素的晶体结构。
The limit for carbon monoxide is 4.5 per cent of the exhaust gas.
尾气中一氧化碳的排放量限制在4.5% 以下。
The drawing is transferred onto the wood by means of carbon paper.
图样是通过复写纸摹绘到木头上的。
Carbon dust and oil build up in large motors and cause them to short-circuit.
碳尘和燃油在大发动机里越积越多，造成了发动机短路。
In fact it is mostly carbon dioxide.
事实上，它主要是二氧化碳。
This temporarily lowers carbon carrying capacity.
这暂时降低了碳承载力。
Are the outlines of the carbon cycle really that familiar?
碳循环的轮廓真的是我们所熟悉的那样子么？
They forget about one of the key causes of carbon dioxide.
他们忘记了二氧化碳产生的其中一个关键原因。
Richer countries must do more to cut back carbon emissions.
较富裕的国家必须作出更大的努力来减少碳排放量。
It is important to increase city canopy cover and carbon storage.
重要的是增加城市林冠覆盖度和碳储量。
Today, however, the potential problem is too much carbon dioxide.
但如今，潜在的问题是二氧化碳过多。
A third is certain basic chemicals such as carbon, oxygen and nitrogen.
第三种是某些基本的化学物质，如碳、氧和氮。
Glasgow City Council has made a deal with Scottish Power on carbon emissions.
格拉斯哥市议会与苏格兰电力公司就碳排放达成协议。
Carbon dioxide and methane in the atmosphere block the escape of heat into space.
大气中的二氧化碳和甲烷阻止热量向太空散发。
We do not know whether lower carbon footprints will always be better for biodiversity.
我们不知道低碳足迹是否总是有利于生物多样性。
Efficiency is also a great way to lower carbon emissions and help slow global warming.
提高效率也是减少碳排放和帮助减缓全球变暖的好方法。
Under the atmosphere, scientists think there is a very thin crust of carbon and oxygen.
科学家们认为在大气层下存在着一层由碳和氧组成的稀薄地壳。
Scotland will reach the national target in carbon emissions reduction ahead of schedule.
苏格兰将提前实现全国碳减排目标。
We will continue to work to ensure that all countries benefit equally from carbon finance.
我们将继续致力于确保所有国家都平等地从碳融资中受益。
Nowadays forests are increasingly welcome because they suck in carbon pollution from the air.
因为森林能吸走空气中的碳污染，所以现在它们变得越来越受欢迎了。
She's a carbon copy of her mother.
她和她妈妈长得一模一样。
She is a carbon copy of her sister.
她跟她姐姐长得一模一样。
When there's more solar wind activity, less carbon-14 is produced.
太阳风活动越频繁，产生的碳14就越少。
Agreement on an international carbon-price floor would be a good starting point in that process.
就国际碳价格下限达成的协议将是这进程中一个良好的起点。
Excess carbon in the atmosphere?
大气中的碳过多了吗？
多少的碳排放量才是太多？
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