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1·When the twin towers fell, Americans stopped traveling.

当双子塔倒塌时，美国人暂停了行走的步伐。

2·When the twin towers fell, Americans stopped travelling.

当双子塔倒塌时，美国人暂停了行走的步伐。

3·The building stands in the area where the twin towers of the World Trade Center once stood.

该建筑坐落在世贸中心双子塔曾经矗立的地方。

4·On September 11, 2001, a group of terrorists destroyed these twin towers and killed nearly 3,000 people.

2001年9月11日，一群恐怖分子摧毁了双子塔，造成近3000人死亡。

5·A:The twin towers collapsed.

双子星大楼倒了.

6·The attack on the twin towers happened the next day.

而就在致电之后的第二天，双子楼袭击事件发生了。

7·The twin towers could not have been brought down by fire.

他说，双子塔不可能是被火烧毁的。

8·Did you see the hijacked planes crash into and destroy the twin towers?

你亲眼看见那几架被劫持的飞机撞向双子塔了吗？

9·He saw the Twin Towers hit and lost many of his colleagues that day.

他看到双塔被击中，并在那一天失去了许多同事。

10·The Lower Manhattan skyline, with the twin towers, can be seen in background.

背景中可以看到曼哈顿下城和双塔的轮廓。