They're both made of carbon, and yet one of them has carbon atoms in it that are arranged in one particular way -- on the left -- and you get graphite, which is soft and dark.
他们都是由碳做成的， 不过其中的一个是由碳原子以独特的方式 组合而成的，形成了左手边的石墨， 柔软和漆黑。