The towers are made of steel cased in granite.

这些塔楼是钢结构，花岗岩贴面。

《牛津词典》

If the wooden frame of the towers had caught fire, it could have sent the bells the largest of which, the Emmanuel Bell, weighs 13 tons crashing down, potentially causing the collapse of both towers.

如果双塔的木制框架起火，可能会导致最大的钟——重达13吨的伊曼纽尔钟倒塌，从而可能会导致双塔倒塌。

youdao

You may see the towers from here; and that wood there—that is my father's park.

从这里你可以看到堡垒；那边的树林——那是我父亲的猎园。

youdao

The towers cost $2,200 to set up, but very little to operate.

VOA: standard.2010.05.25

The Twin Towers had the same function in New York that the Eiffel Tower has in Paris.

双子座对于纽约的作用,与埃菲尔铁塔对于巴黎的作用相同。

耶鲁公开课 - 文学理论导论课程节选

And if I want to move towers, let's say, size 5, from, to, and spare, there are the instructions for how to move it.

比如说五个吧，从这儿到那儿，中间再经过这个多余的柱子周转，关于怎么移动已经有说明了。

麻省理工公开课 - 计算机科学及编程导论课程节选

One week ago, two hijacked commercial jets slammed into the World Trade Center, collapsing the towers.

CNN: U.S. warned in 1995 of plot to hijack planes, attack buildings

Those numbers don't include the 157 people aboard both planes that crashed into the towers.

CNN: Recovery: More layoffs in the air

The firemen would have taken care of them even as the towers were falling.

FORBES: Connect