自“9·11”恐怖袭击后,美国政府一直为怎样有效阻止类似袭击再次发生而绞尽脑汁,加利福尼亚大学的爱德华·李教授宣称他已发明了一种“软件墙”,所有安装上该“软件墙”的飞机都无法再飞到被禁止飞行的城市附近,即使恐怖分子劫持民航飞机再次撞向美国某座城市,“软件墙”也会使飞机自动偏离航向,使飞机“擦城而过”! Since the terrorist attacks of September 11, the U.S. government has been racking its brains on how to effectively prevent the recurrence of similar attacks. Prof. Edward Li of the University of California claimed that he had invented a “software wall” and that all were installed. “Software Wall” aircraft can no longer fly near cities where flights are forbidden. Even if the terrorist hijacked a civil aircraft and crashed into a city in the United States again, the “software wall” will automatically deviate the aircraft from its course, causing the aircraft to “wipe past the city.” "!