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Things of the charcoal element are made up of much carbon. Just look deep into the charcoal to see all the carbon in there.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
一酸化炭素と二酸化炭素の違いは何ですか？
What’s the difference between carbon monoxide and carbon dioxide?
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