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。
Organic compounds contain carbon in their molecules.
有机化合物的分子里含碳。
Dissolved carbon dioxide makes the water more acidic.
溶解的二氧化碳使水更具酸性。
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。
We all need to look for ways to reduce our carbon footprint.
我们都需要寻找减少我们碳足迹的办法。
Burning fossil fuels uses oxygen and produces carbon dioxide.
燃烧化石燃料消耗氧气并产生二氧化碳。
Industrialized countries must reduce carbon dioxide emissions.
工业化国家必须减少二氧化碳的排放。
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。
Plants absorb carbon dioxide from the air and moisture from the soil.
植物从空气中吸收二氧化碳，从泥土中吸收水分。
A spokesperson commented that levels of carbon dioxide were very high.
发言人称二氧化碳的含量很高。
The proposed initiative would mandate a reduction of carbon dioxide of 40%.
这个倡议将把二氧化碳排放量强制降低40%。
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。
Reducing levels of carbon dioxide in the atmosphere is of critical importance.
减少大气层中的二氧化碳含量极其重要。
You can liquefy the carbon dioxide to separate it from the other constituents.
你可液化二氧化碳以使它与其他成分分离。
Mars has an insubstantial atmosphere, consisting almost entirely of carbon dioxide.
火星周围有一个薄薄的大气层，几乎全由二氧化碳构成。
The emission of gases such as carbon dioxide should be stabilized at their present level.
二氧化碳之类气体的排放应该被控制在目前的水平上。
You can make your flights carbon neutral by planting trees to make up for the greenhouse gas emissions.
你可以通过种树抵消温室气体排放，这样你的飞行就可以做到碳中和。
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？
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。
The particles interfere with the formation of carbon-14 on earth.
这些粒子干扰了地球上碳-14的形成。
The particles interfere with the formation of carbon-14 on earth.
这些粒子干扰了地球上碳-14的形成。
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