Once upon a time there lived a stone-cutter who went every day to a great rock in the side of a big mountain and cut out slabs for gravestones or for houses.
从前有一位切石匠，他每天都会来到一座大山旁边的巨石前，切割下一块块的石板用以制作石碑或建造房屋。
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The rock resistance to abrasion is one of the key elements which influence the degree of the cutter attrition and it has close relationship with the rock physical mechanics.