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4G
描述
4G, short for fourth generation, is the fourth generation of mobile telecommunications technology, succeeding 3G and preceding 5G. A 4G system, in addition to the usual voice and other services of 3G, provides mobile broadband Internet access, for example to laptops with wireless modems, to smartphones, and to other mobile devices.
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Read more here: https://en.wikipedia.org/wiki/4G
Watch similar videos here: http://www.dailymotion.com/playlist/x42kaf_wikivideos_information-technology
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