positive: The third plane was flown into the Pentagon, which is a large building near Washington, DC that is the headquarters (or most important building) for the U.S. military.<br>第三架飞机飞向了五角大楼,也就是首都华盛顿附近的大型建筑物,美国军队的总部(或最重要的建筑)。<br>The fourth plane crashed in a field in Pennsylvania, a state that's also in the northeastern part of the country.<br>第四架飞机在宾夕法尼亚州的田野里坠毁,该州也位于美国的东北部。<br>Many people think that the hijackers had wanted to crash that plane into the White House where the president lives, but the people on the plane stopped them from doing that.<br>许多人认为劫机者想要把飞机撞向美国总统居住的白宫,但是机上的人阻止了他们那样做。<br>Almost 3,000 people died in the terrorist attacks that day.<br>那天将近有三千人死于这次恐怖袭击。<br>The attacks had a big effect on the economy, too.<br>这次袭击对经济也有着很大的影响。<br>Many businesses in the World Trade Center and nearby buildings had to close because they had too much damage and they had lost too many employees.<br>世界贸易中心及邻近大厦里的许多企业都不得不关门,因为他们受到了重创,他们损失了太多的雇员。<br>All airplanes were grounded, meaning that they we
negative: 事件发生后,正在佛罗里达州视察的美国总统G.W.布什立即返回华盛顿,并授权有关机构专门调查此案。同时,布什宣布全球美军处于高度戒备状态,并要求采取一切措施,保护美国公民的安全,确保美国政府正常运转。联邦调查局(FBI)几乎投入所有资源在全美各地展开调查。9月12日,美国司法部长宣布,美情报机关截获本·拉登的支持者商议攻击世贸中心和五角大楼的谈话,并确认了一些劫持4架民航飞机的恐怖活动嫌疑犯。9月14日,美国联邦调查局公布了涉嫌参与劫机并发动恐怖袭击行动的19人名单。这19个人均直接或间接同本·拉登有联系,其中7人是飞行员。同日,美参议院一致通过决议,授权布什总统运用一切必要力量,打击发动恐怖袭击和为恐怖分子提供庇护和帮助的国家、组织和个人。9月15日,调查恐怖袭击案的美国联邦调查局人员正式拘捕了第一名嫌疑犯。9月18日,美国联邦调查局宣布已有49名嫌疑人被拘留。