拓荒者的足迹——记卫生统计学家、医学教育家郭祖超教授徐勇勇在中国人民解放军第四军医大学绿树掩映的校园里，经常可以看到一位老人在别人的搀扶下缓缓行走在上下班的人流里。他看上去普通极了，身穿布军装，脚蹬解放鞋，个头不高，面庞清瘦，不时向过往的行人点头微笑... Trail pioneer - in health statisticians, medical educators Professor Guo Zushao Xu Yong Yong Fourth Military Medical University in the Chinese People’s Liberation Army set off on a tree-lined campus, you can often see an elderly man walking slowly under the help of others The flow of people from get off work. He looks very ordinary, dressed in military uniform, pedal liberation shoes, tall, thin face, from time to time past pedestrians nod smile ...