For more than a century researchers have known the basics of how limestone caves form: a tiny fracture opens in the rock perhaps due to some internal stress and water begins percolating through it.
超过一个世纪以来，研究者就懂得石灰岩洞形成的基本原理：可能由于内部的压力，石头上出现了微小的裂缝，然后水开始渗透。
For more than a century, researchers have known the basics of how limestone caves form: a tiny fracture opens in the rock, perhaps due to some internal stress, and water begins percolating through it.
超过一个世纪以来，研究者就懂得石灰岩洞形成的基本原理：可能由于内部的压力，石头上出现了微小的裂缝，然后水开始渗透。
Composition design can have great effect on reducing and improving the internal stress and its distribution, making it possible for grinding ball improvement treatment to achieve better effect.
成分设计对减少和改善内应力及其分布具有较大作用，它可促使磨球改性处理得到更佳效果。
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