Nasa was asked to monitor the area above Manhattan after the Twin Towers came down and its satellite photographs the smoke rising from Ground Zero the following day.

在姊妹楼倒塌之后，美国宇航局监控着曼哈顿上空的地区。第二天他们的卫星也拍下来了烟雾上升的照片。

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We have seen the Twin Towers collapse hundreds of times on TV. The steel and glass skyscrapers exploding like a bag of flour, the dust and smoke pluming out across Manhattan.

在电视上，我们曾无数次地看着世贸双塔轰然倒地：这个由钢筋混凝土铸成的摩天大楼如一大包爆炸了的面粉，烟尘滚滚弥漫了整个曼哈顿。

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Smoke billows from one of the towers of the World Trade Center and flames and debris explode from the second tower, Tuesday, Sept. 11, 2001.

2001年9月11日，星期二，黑烟从世贸大厦双塔的其中以塔喷涌而出，烈火和碎片从第二座塔爆裂开。

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As thousands fled the searing flames and smoke of the Towers, Officer Barry was attempting to reach trapped and frightened workers on the upper floors.

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But in the face of panic, of sinister towers of smoke, of invisible and implacable threats, the reasonable course is not an easy one.

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