Part of the rock wall overhung the path at one point.
部分岩壁悬在了小径一处的上方。
A borehole image of rock layers indicating an underground point bar.
指示某地下曲流沙坝的一幅岩层钻孔图像。
But exactly when the rock masses reach the breaking point is a mystery.
但是，岩层承受的最强地应力究竟是多少，却仍然未知。
But exactly when the rock masses reach the breaking point is a mystery.
但是，岩层承受的最强地应力究竟是多少，却仍然未知。
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