基于阶谱块体单元法，提出了二次覆盖的概念和一种分析岩石块体受拉开裂破坏的方法。

Based on the hierarchical block element method presented earlier, a new concept of subordinate cover and a method to simulate the tension crack in rocky block are proposed.

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尽管迈克尔确有普遍白癜风的迅速传播，他并没有失去所有花色素岁，他第一次覆盖深色轻然后行动，甚至他的肤色。

Although Michael does have universal Vitiligo which spread rapidly he did not loose all pigment it took yrs and he covered it first with dark then with light make-up to even out his skin tone.

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1962年，这座塔第一次修建，覆盖在外墙上的是薄薄的方形石头。

When the tower was first constructed in 1962, the exterior walls were covered with thin square stones.

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