现代社会正从多方面、多层次的方向迅速发展。而信息技术已成为其发展的重要标志。为了积极发展信息科技，迎接信息社会的到来，80年代以来，世界上几乎所有的发达国家都已相继建成了国家级的教育和科研计算机网络，并相互连接成为覆盖全球的国际性学术计算机网络Internet。这 The modern society is developing rapidly in many aspects and at various levels. Information technology has become an important symbol of its development. In order to actively develop information technology and meet the needs of the information society, since the 1980s, almost all developed countries in the world have successively established state-level educational and research computer networks and connected each other to become an international academic computer network covering the whole globe . This