There was a deep crack in the ceiling above him.
他头顶上的天花板上有一个很深的裂缝。
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。
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。
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