过去的一个世纪里,美国在科技创新领域中居世界领先地位,部分归功于美国国防部和国家航空航天局精心计划的采购项目。例如,在20世纪40年代,五角大楼投资建设了第一台通用计算机,最初的设计目的是为美国陆军计算炮弹发射表。20年后,它开发了数据通信网络,被称为阿帕网,是互联网的前身。但自20世纪80年 Over the past century, the United States has led the world in science and technology innovation, thanks in part to well-planned procurement projects by the U.S. Department of Defense and NASA. For example, in the 1940s, the Pentagon invested in the first general-purpose computer, originally designed to calculate a projectile launcher for the United States Army. Twenty years later, it developed a data communications network called the Apache, the predecessor of the Internet. But since the 20th century 80 years