学者张中行30年代在北大求学。据他回忆,当时风气,师长及校方很宽容来自学生的质疑和批评。张举了三个例子:例一,公开质疑。“一次是青年教师俞平伯讲古诗,蔡邕所作《饮马长城窟行》,其中有‘枯桑知天风,海水知天寒’两句。俞说:‘知就是不知。’一个同学站起来说:‘俞先生,你这样讲有根据吗?’俞说:‘古书这种反训不少。’接着拿起粉笔,在黑板上写出六七种。 Scholar Zhang Zhonghang in the 30s to study at Peking University. According to him, at that time, the ethos, teachers and schools were very tolerant of students’ questions and criticisms. Zhang cited three examples: First, openly questioned. ”Once the young teacher Yu Pingbo about ancient poetry, Cai Yong made“ Yinma Great Wall Cave trip ”, which has ’Sang know the wind, sea known to the cold’ two .Yu said: ’know is I do not know.’ A classmate station Saying: ’Mr. Yu, do you have a basis for this?’ Yu said: “This ancient book has a lot of counter-instruction.” Then he picked up the chalk and wrote six or seven kinds on the blackboard.