Nearly all those in floors below the impact survived , however , while all but a handful of those above died - because the crashed planes severed all lifts and each tower ' s three emergency staircases 在飞机撞击部位上面楼层工作的人员中，除了一小部分外，大都没能逃脱厄运。飞机的猛烈撞击不仅切断了电梯的运行，而且还使每栋塔楼中的3条逃生通道被阻断。
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