甚至在第二次撞击发生后，南楼还有一条楼梯可通向外面的街道。
Even after the second airplane struck, an open staircase connected the upper reaches of the south tower to the street.
陨坑中心可能是由于不同寻常的下层地质结构导致的，也有可能因为幸运的二次撞击而形成的。
The central crater could be formed by unusual layers below the surface, or from a lucky second impact.
高能量长叶片撞击将形起大变形，叶片弯曲成U形，机匣在第二次撞击处被撕裂击穿。
The impaction of long blade with high energy can cause large deformation and the blade will curl as U shape and tear the wall of the containment ring at the second impact position.
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