它的中心思想是：滚动磨擦代替了滑动磨擦。

Its crucial idea is to use the rolling friction to replace the sliding friction.

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这类岩石缺乏面理构造，是由于矿物颗粒的脆性碎裂，旋转以及颗粒边界的磨擦滑动和扩展而造成的。

These rocks are lack of foliation and resulted from the brittle fragmentation of mineral grains with rotation of grain fragments accompanied by fractional grain boundary sliding and dilatancy.

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