每天上午１０时，北大广播台都准时播出课间操的讯息和乐曲：“一二三四”“一二三四”……亲切的召唤，铿锵有力的韵律，美妙动听的乐曲，回荡在燕园上空。一听到广播，年近耄耋的马寅初先生就立刻套好笔帽，敏捷地整整衣襟，阔步从办公楼走出来，走向附近的操场和大家一起做 Every morning at 10 a.m., Peking University radio stations broadcast the messages and music of the inter-day classes on time: “One Two Three Four” and “One Two Three Four” ... kind calls, sonorous vignettes, beautiful sounds and melodies Over the sky As soon as he heard the radio, Mr. Ma Yinchu, who was recently in dismay, immediately put on his cap and swiftly lashed his placket and walked from the office building to the nearby playground to work with everyone