1937年7月7日,日军挑起“卢沟桥事变”。清华“因地处平西,毗连宛平,当七七之夜,敌人进攻卢沟桥,枪炮之声,校内清晰可闻。”[1]当时学校正值暑假,大部分学 July 7, 1937, the Japanese provoked “Marco Polo Bridge Incident ”. Tsinghua University “was located in Pingxi and was adjacent to Wanping. When the night of July 7 was over, the enemy attacked the Lugou Bridge and the sound of guns was clearly heard in the school.” [1] At that time, the school was in summer vacation and most of the schools