In this paper, the cation exchange capacity in mud stone and shale is determined by using a simple testing method.
本文使用简单的测试手段，测定了泥页岩中的阳离子交换容量。
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。
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