美籍华裔物理学家扬振宁教授在中国特别是在七十年代是一位家喻户晓的人物。他于一九五七年与李政道一起获得诺贝尔物理学奖,是第一位回国访问的美籍科学家。他的访问叩开了中国紧闭二十多年的科学大门。在他第四次访问中国时,受到了毛泽东主席的接见—— Professor Yang Zhenning, a Chinese American physicist, is a well-known figure in China, especially in the 1970s. He won the Nobel Prize in Physics in 1957 with Li Zhengdao and was the first American scientist to return home. His visit opened the door to science in China for more than two decades. When he visited China for the fourth time, he was interviewed by Chairman Mao Zedong -