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carbon (不可数) 作主语或定语
碳作不可数名词时，指化学元素。
Carbon is a chemical element found in all organic compounds.
碳是存在于所有有机化合物中的一种化学元素。
碳
carbons — plural of carbon
先理解核心含义，再看它在真实句子里的用法。
碳
a nonmetallic chemical element (symbol C) that exists in all organic compounds and in forms such as diamond and graphite
Carbon is a chemical element found in all organic compounds.
碳是存在于所有有机化合物中的一种化学元素。
化学元素，符号 C
化学元素(符号C),原子序数6。纯态如石墨(黑色有光泽极软)或金刚石(无色透明结晶,最硬物质)。
The chemical element (symbol C) with an atomic number of 6. It can be found in pure form for example as graphite, a black, shiny and very soft material, or diamond, a colourless, transparent, crystalline solid and the hardest known material.
该元素的一个原子,指分子中的碳原子。
An atom of this element, in reference to a molecule containing it.
由不纯碳构成的化石燃料,如煤或木炭。
A fossil fuel that is made of impure carbon such as coal or charcoal.
煤烟。
Soot.
Carbon is an element that is present in all living things.
碳是存在于所有生物中的一种元素。
Diamonds are a pure form of carbon.
钻石是碳的一种纯净形态。
Burning wood releases carbon into the air.
燃烧木材会向空气中释放碳。
碳作不可数名词时，指化学元素。
Carbon is a chemical element found in all organic compounds.
碳是存在于所有有机化合物中的一种化学元素。
carbon可数，指用复写纸或复印机做出的副本。
Please make a carbon of this document.
请复印这份文件。
carbon常与名词连用，表示与碳相关的概念。
Carbon emissions are a major cause of climate change.
碳排放是气候变化的主要原因。
Not this
We need to reduce the carbon in the atmosphere.
Use this
We need to reduce carbon dioxide in the atmosphere.
在表示‘二氧化碳’时，不能直接用carbon，而应当用carbon dioxide。Carbon仅指碳元素，而温室气体是二氧化碳。
Not this
Diamonds are made of a carbon.
Use this
Diamonds are made of carbon.
Carbon作为物质名词（碳元素）是不可数名词，前面不能加不定冠词a。正确的用法是不加冠词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
二氧化碳
Carbon dioxide is a greenhouse gas that contributes to global warming.
二氧化碳是一种导致全球变暖的温室气体。
碳足迹
Reducing your carbon footprint can help mitigate climate change.
减少碳足迹有助于缓解气候变化。
碳排放
Many countries are working to lower their carbon emissions.
许多国家正在努力降低碳排放。
碳补偿
They purchased carbon offsets to neutralize the emissions from their flight.
他们购买了碳补偿以抵消航班的排放。
碳捕集
Carbon capture technology can remove CO2 from industrial exhaust.
碳捕集技术可以从工业废气中去除二氧化碳。
碳纤维
Carbon fiber is used to make lightweight and strong materials for aircraft.
碳纤维用于制造轻便而坚固的飞机材料。
一模一样的人或物；副本
She is a carbon copy of her mother.
她和她母亲一模一样。
碳足迹
We need to reduce our carbon footprint.
我们需要减少碳足迹。
碳抵消
They purchased carbon offsets for their flight.
他们为航班购买了碳抵消。
这个星系中的所有生命都是以碳为基础的。
In Star Trek: The Next Generation, an ancient alien race programmed a message into DNA revealing that all life in the galaxy shares a common carbon-based origin.
在《星际迷航：下一代》中，一个古老的外星种族将信息编入DNA，揭示星系中的一切生命都源于共同的碳基。
碳是所有生命的基本成分。
This line from the documentary series Planet Earth emphasizes the fundamental role of carbon in biology and ecology.
这句话出自纪录片系列《地球脉动》，强调了碳在生物学和生态学中的基本作用。
Use carbons naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
“carbon”音似“卡本”，想象一张碳纸夹在本子里复写，卡住纸张。记住碳的副本就是复写纸。
[object Object]
作为化学元素时不可数，作为复写纸副本时可数，常用复数carbons表示多种碳或副本。
Dictionary facts from ECDICT, WIKTIONARY.