Very rude awakening: Where were you when the towers were hit?

猛然惊醒：当五角大楼被撞时你在哪？

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He was two blocks away when the towers fell, and he saw everything.

世贸大楼倒下时，他就在两个街区之外，目睹了一切。

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When the towers is under load, the central pole is lifted and the running gear of the tower is also lifted from the top of the track.

当塔架作业时，中心立柱将被顶起，塔架的走行结构也将被顶离轨顶。

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Nicholas Church, a modest 170-year-old building that had stood next to the World Trade Center and was destroyed when the towers fell.

CNN: First families begin filing death certificates

Sally Regenhard, whose son Christian -- a probationary firefighter -- died when the towers collapsed, said she was not surprised by the find.

CNN: NY police: Landing gear part found, is tied to 9/11

The floors of the twin towers lie stacked one on top of the other, the result of the "pancake effect" when the towers collapsed.

CNN: workers