自然界中碳的存在形式主要为气态和固态。
这种压力不断作用于富含碳元素的白矮星成分，使其自身结晶成碳的同素异形体，也就是我们所说的钻石。
And that pressure, acting on the carbon-rich makeup of the White Dwarf, may have crystallized much of it to the particular form of carbon we call diamond.
碳的同素异形体包括金刚石、石墨和木炭，所有这些物质都具有相同的化学性质。
The allotropes of carbon include diamond, graphite and charcoal, all with the same chemical properties.
线型碳是1968年在自然界发现的一种碳的新同素异形体。
Carbyne is a new allotrope of carbon which had been found in nature in 1968.
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