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PBS

(2009-10-11 07:00:00)
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分类: EVERYDAY

     Nearly all TV in the USA is commercial,and programs are interrupted every quarter of an hour or so for advertisements.These breaks make people upset ,especially during some exciting action in a good film. However, commercials do make it possible to show programs on TV that are expensive to produce.

    在美国,几乎所有电视频道都会播放商业广告,节目每播放15分钟左右就会插入广告。节目经常被打断使人们感到厌烦,特别是在一部好电影的精彩片断正播放时更是如此。然而商业广告的确使耗资巨大的节目得以播出。

     There is one channel where there are no commercial breaks. Programs on this channel are run by the Public Broadcasting Service(PBS) and can be seen all over the USA. Although the PBS gets a grant from the government, the government does not interfere in any way in the organization of its programs.There are programs on everyday affairs, music,the arts, as well as serious discussions on all kinds of topics. Some programs are supported by companies or institutions,but these organizations are not allowed to influence the content of a program.    

    仅有一个频道不存在商业广告的打扰。该频道播放由公众广播服务公司制作的节目,全美国的人们都能收看到。尽管公众广播服务公司是由政府拨款支持的,但政府丝毫不会干涉其节目的安排。该频道的节目多种多样,有每日时事、音乐、艺术以及有关各种话题的严肃讨论等。其中一些节目由公司或机构赞助播出,即使如此,也不允许它们干预节目的内容。

      A radar set includes a transmitter and a receiver.The transmitter works somewhat like a radio broadcasting station, but the receiver operates more like a television receiver and translates the echoed radio waves into a sort of picture.

    The transmitter is a very special sort of broadcasting station. It sends out, at regular intervals,short bursts of high-frequency radio waves. These radio waves can go through clouds, and, of course, darkness does not hinder them. They continue to move out in a straight line from the transmitter until they strike something solid,such as building.Then they reflect back, much as light is reflected when it strikes an object. the reflected waves,moving back to the radar set ,are received and translated into a tiny spot of light on the viewing screen.

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