急求课前三分钟英语演讲稿

就是英语课前演讲,二三百字左右4天后就该我演讲了,得提前准备准备大家帮帮忙啊!!... 就是英语课前演讲,二三百字左右4天后就该我演讲了,得提前准备准备大家帮帮忙啊!! 展开
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找资料好文章
2012-03-08 · TA获得超过182个赞
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HOW ARE TV PICTURES MADE?

A TV picture starts with a TV camera. Some TV cameras are big and some are small. The cameras in TV studios are big. Camera operators roll the big cameras around on wheels. There are usually several big cameras in a TV studio. Cameras used outside a TV studio are smaller. TV camera crews take the smaller cameras to news and sports events.

Some cameras send out live pictures to your TV set. Some cameras make videotapes that get played later on a television program.

All TV cameras need electricity to work. A camera operator points the camera at a scene. The camera picks up light from the scene. It changes this light into an electric signal called the video signal. A microphone changes the sound of people talking or music playing into an electric signal called the audio signal.
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自动覆盖好
2013-10-09
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What is success? Everyone has his own interpretation as I do. But I am sure every success leads to an ever-brighter future. So ladies and gentlemen, believe in our hopes, believe in ourselves, we, every one of us, can make a successful life!
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