A natural dark brown to black graphitelike material used as a fuel,formed from fossilized plants and consisting of amorphous carbon with various organic and some inorganic compounds.

 
  • 煤一种天然的深褐色到黑色石墨样原材料,用作燃料,由植物化石形成,由非结晶碳和各种有机化合物与一些无机化合物组成。
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