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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In the World Trade Center Tower One, there's almost 600,000 feet of space below grade.

在世贸中心一号塔楼中，几乎有600,000平方英尺的地下空间。

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One World Trade Center tower in New York City was completed in nineteen seventy-two.

VOA: special.2010.03.31

In addition to holding the steel contract at One World Trade Center, DCM is putting up steel for 4 World Trade Center, a 72-story tower.

WSJ: Steel Firm's Woes Snag World Trade Center

It is located one block west of the new 104-storey One World Trade Center (also known as the Freedom Tower).

BBC: Business trip: New York City

And it was on hand at the early stages of rebuilding, as it won a contract to put up steel for the site's signature tower, One World Trade Center, in 2006.

WSJ: Steel Firm's Woes Snag World Trade Center