刚刚过去的２０世纪，是人类社会发生巨变的伟大时代。 在这个世纪里，原子能技术。生物技术、信息技术和空间技术等，捷报频传，飞速进展，新理论、新成果、新应用接连问世，令人目不暇接，眼花缭乱。 据粗略估计，２０世纪前５０年的研究成果，远远超过１９世纪；而到了６０ The twentieth century just passed is a great time when the great changes have taken place in human society. In this century, atomic energy technology. Biotechnology, information technology and space technology, etc., fast moving, rapid progress, new theories, new achievements, new applications come out one after another, dizzying, dazzling. According to a rough estimate, the research results of the first half of the 20th century far exceeded those of the 19th century; while at 60