http://www.youtube.com/watch?v=_KKtK6L4XOA
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![](http://www.chinesecivilization.net/wiki/images/8/81/DownloadHelperAddon.jpg)
如何下载高清晰的Youtube视频
First,installFirefoxWebBrowser,thengotoTools->Addons,andinthesearchbox,type'DownloadHelper'.
Clickonthebutton"AddtoFirefox"toinstalltheadd-on.Whenfinishedinstallation,restarttheFirefoxbrowser.AfterFirefoxisrestarted,youwillnoticeanadditionaliconnexttotheaddressbar,withthreespinningcolourballs.
Congratulations!YouarenowreadytodownloadallsortsofvideosfromYouTu...[
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http://www.youtube.com/watch?v=IMquM1UCWy8
http://www.youtube.com/watch?v=kaf2DCAxTVk
http://www.youtube.com/watch?v=TUW4j1M6njM
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http://www.youtube.com/watch?v=GFVtbkmGTyE
http://www.youtube.com/watch?v=t52-rLAr_Lk
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