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冷战时期,美国和西方国家对前苏联的先进战机开发项目非常好奇,侦察照片、数据分析和研究报告层出不穷。但毕竟后者属于外界无法企及的高度机密,这
During the Cold War, the United States and Western countries are very curious about advanced fighter development projects in the former Soviet Union. Reconnaissance photos, data analysis and research reports are endless. But after all, the latter belongs to the high degree of confidentiality that the outside world can not match