Flowing of underground water along faulted zones in marble eroded and corroded wall rocks and formed underground rivers, which finally created karst caves.
断裂带产生于大理岩之中，地下水沿断层破碎带运移，并对岩石进行浸蚀与溶蚀进而发育地下暗河，冲蚀加剧，最终形成今日看到的溶洞。
Based on the law of energy conservation, the velocity expression of the abrasive flowing along the wall of the round pipe is derived.
根据能量守恒定律，推导出磨料在圆管边壁处的速度表达式。
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