英语语法分析

The shale roof-made of the sediment that destroyed the forest so long ago-is cracking and flaking off now that the coal below it has been removed.

页岩层顶部是由远古时候掩埋森林的沉积物构成。由于埋藏其下的煤已经被挖走，所以这些页岩有开裂和剥落现象。

The wear mechanism of composites is mainly repeating toughness deform and fatigue flaking off.

表面复合材料的磨损机理主要是反复塑性变形和疲劳剥落。

Do not tear off flaking skin; you may break nearby healthy skin and spread the infection.

但是不要撕掉那些薄片，那样可能会伤害到周围健康的皮肤。