高分找人翻译一个课文,好的追分CATVisashortwaysaying“communityantennatelevision?But“cabletelevision?isthenamemostpeopleuse.CabletelevisionallowsviewerstoreceiveTVprogramsthattheycannotpickupwiththeiror
高分找人翻译一个课文,好的追分
CATVisashortwaysaying“communityantennatelevision?But“cabletelevision?isthenamemostpeopleuse.CabletelevisionallowsviewerstoreceiveTVprogramsthattheycannotpickupwiththeirordinaryantenna.
Televisionsignalsdonotfollowthecurveoftheearth.Theytravelinstraightlinesinalldirections.SignalsfromaTVstationmovetowardsthehorizon(水平线)andthengointospace.IfyouliveonlyafewmilesfromaTVstation,youmaygetagoodpictureonyourset.Butifyoulivemorethan50milesfromastation,youmaynotgetanypicturesatall.
CATVbeganin1948.PeopleinplacesfarfromTVstationshadtopayforputtinguphighantennas.Acommunityantennawasusuallyplacedonahill,amountainoronahightower.
TheantennapickedupTVsignalsandfedthemintoasmalllocalstation.Fromthestation,thickwirescalledcableranouttonearbyhomes.Eachpersonusingthecablepaidamonthlycharge。
要读的通的

