The word television, derived from its Greek and Latin 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 into electronic impulses, which can be sent through a wire or cable. These impulses, when fed into a receiver , 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.
英语口语8000句之见面分手[1]
实用英语:表达“不了解”意思的句子
用英语表达愤怒
我喜欢吃甜食
英语口语8000句之商业信函结语
爱好和消遣
英语俚语:教练看病去了?
把你给逼疯
谈论奉承
初级入门:英语中如何提问来获得信息(视频)
实用口语:“精彩”比赛的多种表达
免费下载:流利英语(Fluent English)(含音频)
用英语表达责备
遇到麻烦时[1]
谈论人的嫉妒之心
用英语表达失望
生活中常用的五星级英文句子
[实用口语]“做美容”怎么说
回答“谢谢”的几种说法
我只是随口问问
地道口语:走一步看一步
生活口语:shy都是害羞吗
谈论恐惧的事
小编推荐:英语口语在线课程
睡眠不好的英语表达方法
在外用餐[1]
急诊室情景医生护士对话
实用口语:爆冷的“黑马”与意料之中的收获
让自己的口语说的漂亮
奇奇每日英语对话:锻炼肌肉
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |