The topic of He Jiang’s speech was given by Harvard University.

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• Stanley Milgram of Yale University discovered that people are connected by “six degrees of separation”.；This means：
• In 1929, Qian Zhongshu was admitted to Tsinghua University because of his excellent performance in Math, Chinese and English lan
• Harvard University dates from（）
• Harvard University is located in（）
• Which is the official color of Harvard University ？