在部分人士中,有一种说法,这就是“科学无国界”。的确,科学技术是全世界的科学家,在广大人民群众的支持下,共同向前推进的。任何国家科学技术的发展,都离不开向其它国家的学习和相互交流。美国现在是世界上的科技大国,但是,在二十至三十年代的美国,物理学却远远落后于西欧各国。已故著名物理学家周培源教授曾回忆道:“二十年代,我在美国念书时,外国一个科学家到芝 In some people, there is a saying that this is “science without borders.” Indeed, science and technology are scientists all over the world and are moving forward together with the support of the broad masses of the people. The development of science and technology in any country can not be separated from the study and exchange with other countries. The United States is now the world's science and technology powerhouse. However, in the United States in the 1920s and 1930s, physics lags far behind that of Western European countries. The late famous physicist Professor Zhou Peiyuan once recalled: "In the 1920s, when I was studying in the United States, a foreign scientist went to Chi