１９４７年秋，我由燕京大学转学到清华大学，插班入历史系三年级，见到的第一位老师就是慕名已久的雷海宗先生。雷先生当时是历史系主任，新生选课完毕后，照例要由他签字。他给我的第一个印象是对学生很亲切，没有架子。在清华读书两年期间，听了雷先生几门课，给我印象最深 In the autumn of 1947, I transferred from Yenching University to Tsinghua University and transferred to the third grade of History Department. The first teacher I met was known as Mr. Lei Haizong. Mr. Lei was the head of history department at that time. After the freshmen finished their courses, they should be signed by him as usual. The first impression he gave me was that he was kind to the students and had no shelves. During my two years in Tsinghua University, I listened to Mr. Lei a few lessons and impressed me the most