Place protection deep into the crack because the rock is more likely to break on the outside of the crack.
固定点要放进裂缝深处，因为岩块可能在裂缝外面破裂。
Small pieces of rock that break away due to the action of the bit teeth.
由于钻头牙齿的作用而被破碎的岩石小片。
Small pieces of rock that break away due to the action of the bit teeth.
由于钻头牙齿的作用而被破碎的岩石小片。
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