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碳是一个常被人们谈起的话题。但究竟什么是碳呢?碳又是从何而来的呢?碳既是一种天然的物质,又是一种化学元素。纯碳主要是以黑色固体(煤炭)或特别坚硬的透明晶体(钻石)的形式存在。碳只构成地球的一小部分——不到1%——但却是我们体内的重要元素。生物体
Carbon is a topic that people often talk about. But what exactly is carbon? Where does carbon come from? Carbon is both a natural substance and a chemical element. Pure carbon is mainly in the form of black solid (coal) or particularly hard transparent crystal (diamond). Carbon makes up only a fraction of the planet - less than 1% - but it’s an important element of our body. organism