进入２１世纪,人类的活动越来越多地依赖于网络,网络日益成为现代社会的基础结构,人类社会正明显地向网络社会演变。人类目前拥有的网络都是各种各样的通信网,如电信网、计算机网、有线电视网等等,它们的任务都是传递信息。通信网对人类社会发展的最重要贡献,是消除了通信... In the 21st century, human activities are increasingly dependent on the Internet, and the Internet has increasingly become the basic structure of modern society. Human society is evidently evolving into an online society. Humans currently own networks that are all kinds of communication networks, such as telecommunications networks, computer networks, cable networks, etc. whose mission is to transmit information. The most important contribution of the communications network to the development of human society is to eliminate the ...