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: 二战结束后的美国,战争的阴影还没有消失,冷战的恐怖气氛又接踵而至。美国一方面在国际上与苏联对抗,另一方面在国内害怕共产主义起义(Red Scared)。1945年3月,美国众议院以207票赞成、186票反对,将其臭名昭著的“非美委员会”(House Un-American Activities Committee)改为常设机构。与此同时,由于美国国内通货膨胀指数急剧上升,在短短的一年中发生了3.47万次罢工,共有450多万工人走上街头。众院非美委员会借机指责工会 “已被共产党渗透”,极力煽动公众反对共产主义和共产党。1945年3月11日美国总统罗斯福在世的时候,美国联邦调查局借口当年1月26日出版的《美亚》杂志上有一篇文章与他们掌握的一份秘密材料在内容上相似,伙同战略情报局的特工人员一起闯进了《美亚》杂志编辑部,并声称“从办公室搜出1700多份机密级和其他密级的政府文件”。6月6日,联邦调查局再次查抄《美亚》杂志编辑部,声称“搜查出1069页政府文件,其中有504页是保密性质的”。同日,美国司法部以“偷窃政府绝密文件”的罪名逮捕了曾在美军驻中国共产党的根据地延安观察组长期工作的国务院官员谢伟思等6人。