Inmates there are free to watch the national channels, but are not allowed to watch private channels for security reasons.

这些囚犯可自由收看官方频道，但是出于安全考虑，他们不能观看私立频道播放的节目。

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Car ads make up 25% of advertising revenues for local television channels, and carmakers have been among the most consistent buyers of high-priced ads on national television.

汽车广告收入占据了地方电视台广告收入的25%，并且汽车制造商历来都是国家电视台的高价广告的忠实购买者。

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And of course in Britain listeners and viewers can tune in to two BBC television channels, five BBC national radio services and dozens of local radio station.

当然，英国听众和观众可以收到两个BBC电视频道，五个BBC全国广播电台和几十个地方电台。

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They go to explain how valuable their packages are and that they are the HD leader with 30 national channels.

ENGADGET: Live from the EchoStar press conference

SocialTV Timeline and the TV AdSync Network comprise the core of ConnecTV's new social television platform that syncs with every show across more than 400 national channels, local stations and regional sports networks.

ENGADGET: ConnecTV adds SocialTV Timeline for mobile, puts chats with stars on a second screen

His holding company, Fininvest, controls Mediaset, Italy's biggest private television group, embracing three out of the country's six national channels, rakes in half of all television advertising and owns films, mobile-phone and Internet companies.

ECONOMIST: Italy