花岗岩这样的硬质岩石，其岩体质量与结构面关系极为密切。
For hard rocks as granite, rock mass class is mostly associated with discontinuities.
Miller说通过建著复杂的空间结构使沙子底下的硬质岩石暴露出来，赤点石斑鱼创建了一个海藻，珊瑚和海绵可以繁荣生长的空间。
By building complex, three-dimensional structures that expose the hard rock beneath the sand, Miller said, red grouper create an environment in which seaweed, coral and sponges can thrive.
加利福尼亚的Potter Drilling5次使用过热液体穿透花岗岩，花费时间比传统工业快很多，不过这种工艺在试用硬质岩石时表现不佳。
Potter Drilling of California uses jets of superheated fluid to break through granite five times faster than traditional techniques, which don't do well against hard rock types.
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