作为一个产业,美国电视业从20世纪30年代起,经历了一段快速崛起,发展和扩张的过程,到本世纪初,已经形成了拥有6家无线全国传播网——NBC、CBS、ABC、Fox、WB、UPN、1600多家电视台及上百个有线电视频道的庞大的电视传播网络。全美76％的电视台是商业电视台。商业电视台的价值都十分昂贵,一般很少个人有 As an industry, the television industry in the United States has experienced a period of rapid rise, development and expansion since the 1930s. By the turn of the century, the U.S. television industry has formed a network of 6 national radio networks including NBC, CBS, ABC, Fox , WB, UPN, over 1,600 television networks and hundreds of cable TV channels. 76% of the country’s television stations are commercial television stations. The value of commercial television stations are very expensive, generally very few individuals have