加拿大传播学家麦克卢汉有一个广为人们接受的观点：“媒介是人体的延伸。”以这一观点来看，电视这个20世纪最先进的传播媒介使人类的视觉和听觉得到了极大的延伸。之所以能够如此，就在于电视具有兼容多种信息渠道的优势，只有充分、有效地发挥每一种渠道的作用，电视才能最 There is a widely accepted view by Canadian communicator McLuhan: “The media is an extension of the human body.” From this perspective, television, the most advanced medium of the 20th century, has made human beings visually and aurally tremendous The extension. The reason for this is that television has the advantage of being compatible with a wide range of information channels. Only by fully and effectively playing the role of each channel can the television function be the most