上个世纪初期,新闻传播媒体只有一种,即报纸。20年代发明了通过无线电波传送声音的技术,于是有了广播。30年代发明了通过无线电波和导线传送声音和图像的技术,结果出现了电视。60年代发明的通过电脑联网实现高容量信息流快速交互式传递的技术,促进了互联网的发 At the beginning of the last century, there was only one type of news media: the newspaper. In the 1920s, the technology of transmitting sound over radio waves was invented, so that there was a broadcast. The 1930s invented the technology of transmitting sound and images over radio waves and wires, resulting in the appearance of television. Technology invented in the 1960s to enable rapid and efficient transfer of high-volume information flows over computer networks has facilitated the development of the Internet