Education in China and the West: We must permit and encourage students to raise more questions

中西教育：我们必须允许并鼓励学生多提出问题

越战让杜大卫这样认识生命及生命意义，他认为"生命由我儿女延续，思想由我学生传承"。教书，自然成为杜大卫生命意义的载体。他教授的课程针对中国学生独立思考能力、质疑能力、研究能力薄弱而对症下药。
The Vietnam War makes David Tool recognize life and the significance of it. He believes that "my life is continued by my children, my thoughts and by my students." Teaching has naturally become the bearer to show his significance of life. He designs his courses with the aim to improve the weak points of the Chinese students in independent thinking, query capability and research ability.