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20世纪50年代初是美国的“红色恐慌”时代。1950年,麦卡锡分子指控钱学森是共产主义者,并对其秘密进行调查。FBI不知
The early 1950s was America’s “red panic” era. In 1950, McCarthy accused Qian Xuesen of being a communist and investigating his secrets. FBI I do not know