这背后有许多复杂却符合情理和人性的因素。1955年6月的一天,钱学森躲过美国联邦调查局的跟踪,来到一家咖啡店。在那里,他撕下了香烟盒上的硬纸板,匆匆地写下了一张便条,随后迅速塞进了寄往蒋英姐姐的信里,此时她正在比利时,并请求其把这张便条转交给陈叔通。这是一张请求祖国救援的秘密便条。此时的钱学森受到美国“麦卡锡主义”运动的影响,被认为是一个同情共产主义的人,被美国当局软禁监视已经长达5年 Behind this there are many complex but reasonable and human factors. One day in June 1955, Qian Xuesen escaped the FBI track, came to a coffee shop. There, he ripped off the cardboard on the packet of cigarettes, hurriedly wrote a note, and then promptly pushed in a letter to sister Chiang Ying, at which point she was in Belgium and requested that it be forwarded To Chen Shutong. This is a secret note asking for help from the motherland. At this time, Qian Xuesen was influenced by the “McCarthyism” movement in the United States and was considered as a sympathetic communist who had been under house arrest by the U.S. authorities for up to five years