通信技术的四次革命通信技术是人类传递或交流信息的手段和方法。通信技术的演变反映了人类文明与社会进步的历程，重大通信技术的发明是人类文明的标志，通信技术的重大变革对人类社会生活产生深远的影响。在人类漫长的历史中，大体上有过四次通信技术革命。第一次通信技... Four Revolutions in Communication Technology Communication technologies are the means and methods by which human beings communicate or exchange information. The evolution of communication technology reflects the course of human civilization and social progress. The invention of major communication technologies is the symbol of human civilization. The major changes in communication technology have a profound impact on human social life. In the long history of mankind, there have been basically four revolutions in communications technology. The first communication technology ...