Coal deposits, after all, are petrified peat swamps, and peat is made from decaying plants, which leave their imprints in mud and clay as it hardens into shale stone.
毕竟煤炭矿床本身就是石化的泥炭沼泽，而泥炭的成份是腐烂的植物。当粘土泥浆逐渐硬化成页岩石，腐烂的植物则在上面留下了它们的印记。
A generalized sedimentary-tectonic model for extensional coal basin is presented, together with the explanation for the evolution of basin architecture and the conditions of peat accumulation.
本文提出了拉伸煤盆地最一般的沉积—构造模式，并用以解释盆地结构的演化和泥炭聚积的条件。
Coke and semi-coke of coal, of lignite or of peat, whether or not agglomerated; retort carbon.
煤、褐煤或泥煤制成的焦炭及半焦炭，不论是否制成型；甑炭。
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