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30年前(1949年),当我就任应用力学教授时我作的演讲的题目是“应用力学发展的前景”。我曾说了不少乐观,有时甚至是天真的话。我今天把“四十年间苦与甘”作为这次演讲的题目,是为了跟30年前的那篇演讲作一对比。再说,在本周的学术论讨会上已有如此之多的著名科学家就“固体力学的发展方向”发表了权威性的论文。如果我再来介绍固体力学当前的趋势和将来可能的发展方向,就未免是班门弄斧了。我要说的“苦”,主要指我未能完成许许多多我一开始想做的事情;但是与国内外同事40年的友好往来留在我记忆中的主要
Thirty years ago (1949), when I was professor of applied mechanics, I gave a speech entitled “The Prospect of Applied Mechanics.” I have said a lot of optimism, sometimes naive words. Today, I quote “Fortitude and Willingness in Forty Years” as the topic of this speech to contrast with that speech 30 years ago. Besides, at this week’s academic symposium, so many famous scientists have published authoritative papers on “the direction of the development of solid mechanics.” If I come back to introduce the current trends in solid mechanics and the possible future direction, it is inevitable that they are on the wrong track. The “bitterness” I am going to say mainly refers to the fact that I failed to accomplish the many things I wanted to do at the beginning. However, my 40 years of friendly contacts with my colleagues both at home and abroad have remained in my memory.