最近，大多数美国人记得纽约世贸中心被恐怖分子摧毁时他们在做什么。

More recently, most Americans remember what they were doing when the World Trade Center in New York was taken down by terrorists.

恐怖分子的行为令人发指。

The actions of the terrorist are outrageous.

警察在机场逮捕了一名恐怖分子。

The police arrested a terrorist at the airport.

恐怖分子的威胁让人们感到不安。

The threat of the terrorist makes people uneasy.

恐怖分子在城市中心发动了袭击。

The terrorist launched an attack in the city center.