12年前,我初次见到年青的博士生导师郑伟安的,他可谓是风华正茂、神采奕奕,言谈举止全然是个普通人。当我再见到他时,他已是一个身体发福的中年人,不易察觉的皱纹爬上了眼角。但是,他仍然是思维敏捷、谈笑风生。去年金秋的一天,我走进了华东师范大学统计系一间有着4、5张写字桌的办公室。戴着金丝架眼镜、穿着 T 恤 12 years ago, I first met the young doctoral tutor Zheng Weian, he can be described as flourishing, full of energy, speech and behavior is a normal person. When I saw him again, he was a well-bred middle-aged man, and his imperceptible wrinkles climbed his eyes. However, he is still quick-witted, laughing. One day last autumn, I walked into the office of Statistics Department of East China Normal University with 4, 5 desks. Wearing gold wire glasses, wearing a T-shirt