Engineerss had to dig and blast through 73 different kinds of rock, some as hard as granite and others as soft as sugar.
施工人员挖出并炸掉的岩石足有73种之多，有的岩石硬的花岗岩，有的岩石软的像糖果。
Diamond grinding wheels are widely used as grinding tools in manufacturing of hard and brittle materials, such as hard alloy, engineering ceramics, optical glass, semiconductor materials, and granite.
金刚石砂轮广泛用作硬质合金、工程陶瓷、光学玻璃、半导体材料、花岗岩等硬脆难加工材料的磨削工具。
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