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。
They peat and stone construction of a large public housing.
他们用泥炭和石头建造了一个大的公共住宅。
Articles of stone or of other mineral substances (including carbon fibres, articles of carbon fibres and articles of peat), not elsewhere specified or included.
其他品目未列名的石制品及其他矿物制品(包括碳纤维及其制品和泥煤制品)。
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