震害表明，楼梯往往先于主体结构破坏前产生种种严重破坏，影响应急使用。

The earthquake damage shows that the staircase is often before the main structure damage to have all sorts of serious destructions, affecting emergency use.

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地震时，楼梯是重要的逃生通道，然而，汶川大地震震害表明，楼梯间的破坏相当严重。

Earthquake, the stairs is an important means of escape, however, the great Wenchuan earthquake disasters, shows that very serious damage to the stairwell.

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