This high yield, sane design machine is designed to use for horniness materials of low water content, such as shale, coal-stone etc.
该机适用于页岩、煤矸石等含水率低的硬质原料，产量高，设计合理。
2
He could sense the right place to hit so that the rock crust would cleave and reveal the coal, in the same way that a sculptor can sense exactly where to hammer a chisel into a stone.
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.