五四时期,李大钊和毛泽东曾在北京大学图书馆有过一段一起共事的经历,后来,两人又长时间保持密切的交往。正是由于有了这段经历和后来长时间的密切交往,毛泽东才由一个革命民主主义者转变成为一个马克思主义者。李大钊为毛泽东早期思想的变化与发展,创造了必要的条件,为毛泽东后来的一生革命征程奠定了基础。因而,毛泽东称李大钊为“真正的老师”。 During the May 4th Movement, Li Dazhao and Mao Zedong had had experiences working together in the Peking University Library. Later, the two had maintained close contacts for a long time. It is precisely because of this experience and the subsequent long time of close contacts that Mao Zedong was transformed from a revolutionary democrat into a Marxist. Li Dazhao created the necessary conditions for the change and development of Mao Zedong’s early thoughts and laid the foundation for Mao Zedong’s later revolutionary journey. Thus, Mao Zedong called Li Dazhao as “real teacher ”.