美国的经济发展与他对科学技术方面的投入有着密切的关系，任何学术领域都有急需解决和被认为重要的课题，从各个方面，他吸引着众多科技工作者对他的重视。所谓课题，应该指那些在前人或自己在工作的过程中的发现，或出现的一些难以一时解决又十分重要的问题，要解决它，离不 The economic development of the United States is closely related to his investment in science and technology. He has an urgent need to address and is considered an important issue in any academic field. In all respects, he has drawn the attention of many scientists and technologists to him. The so-called topics should refer to the discoveries made by the predecessors or themselves during the course of their work, or some problems that are difficult to solve in a timely manner and of great importance. If we want to solve it or not