值此世纪之交，人类迎接知识经济时代来临，中国实施“科教兴国”方略起步之际，我们对曾为人类作出过杰出贡献的科学家尤感钦佩．我们将永远铭记他们的功绩．在我的友人中，有两位辰学家的功绩就很值得介绍给世人．他们是广州中山医科大学许天禄教授和美籍华人许汉光教授．许 At the turn of the century, as mankind has come to meet the era of knowledge-based economy and China has started its strategy of “rejuvenating China through science and education,” we admire the scientists who made outstanding contributions to mankind. We will always remember their merits. Among my friends, the achievements of two echoes are worthy of introduction to the world. They are Professor Xu Tianlu from Zhongshan Medical University in Guangzhou and Professor Xu Hanuang from Chinese American. Xu