Television -- the most pervasive and persuasive of modern technologies, marked by rapid change and growth -- is moving into a new era, an era of extraordinary sophistication and versatility, which promises to reshape our lives and our world. It is an electronic revolution of sorts, made possible by the marriage of television and computer technologies.
The word "television", derived from its Greek (tele: distant) and Latin (visio: sight) roots, can literally be interpreted as sight from a distance. Very simply put, it works in this way: through a sophisticated system of electronics, television provides the capability of converting an image(focused on a special photo conductive plate within a camera) into electronic impulses, which can be sent through a wire or cable. These impulses, when fed into a receiver (television set), can then be electronically reconstituted into that same image. Television is more than just an electronic system, however. It is a means of expression, as well as a vehicle for communication, and as such becomes a powerful tool for reaching other human beings.
The field of television can be divided into two categories determined by its means of transmission. First, there is broadcast television, which reaches the masses through broad-based airwave transmission of television signals. Second, there is nonbroadcast television, which provides for the needs of individuals or specific interest groups through controlled transmission techniques .Traditionally, television has been a medium of the masses. We are most familiar with broadcast television because it has been with us for about thirty-seven years in a form similar to what exists today. During those years, it has been controlled, for the most part, by the broadcast networks, ABC, NBC, and CBS, who have been the major purveyors of news, information, and entertainment. These giants of broadcasting have actually shaped not only television but our perception of it as well. We have come to look upon the picture tube as a source of entertainment, placing our role in this dynamic medium as the passive viewer.
电视这个领域可以根据其发射方式分为两类。第一类为广播电视，通过电视信号的宽带无线电波发射展现在大众面前;第二类为非广播电视，使用受控的发射技术来满足个人以及某些特殊利益群体的需要。电视早已成为大众媒介。我们熟悉广播电视，因为广播电视已经以类似目前的方式存在了大约 37 年。在那些年头中，电视绝大部分一直由 ABC、NBC、CBS 这 些广播电视公司控制着，这些广播电视公司一直是新闻、信息和娱乐的主要提供者。这些广播业的巨头实际上不仅塑造了电视，而且也塑造了我们对电视的理解。我们渐渐把显像管看作是娱乐的来源，让自己成为这个生动的媒介的被动观众。
例句：He argued persuasively, and was full of confidence.
例句：Honeybees use one of the most sophisticated communication systems of any insect.
transmission：n. 传动装置，[机] 变速器;传递;传送;播送
例句：The transmission of the programme was brought forward due to its unexpected topicality.
例句：Television has displaced film as our country's most popular form of entertainment.
例句：He seemed a dynamic and energetic leader.