英语翻译

英语翻译
以下是一篇英文翻译作业（不是英语课,而是学术课）,要求翻译的严谨,有些句子本意不难,翻译成汉语很别扭,
1 Introduction to TV technology
2 The most common use of television is as a source of information and entertainment for viewers in their homes
3A television program is created by focusing a television camera on a scene.
In a typical television station,the signals from live and recorded features,including commercials,are put together in a master control room to provide the station's continuous broadcast schedule.