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Digital learning of origin, early "correspondence type of far from teaching courses", to text letters by mailing contains with for media, to multimedia technology produced zhihou, from cassette tapes, and VHS, and BETA videos, and wireless TV, and wired TV, and satellite TV, and IPTV, and WiMAX and mobile phone 3G for taught media, digital learning of development with technology progress subsidiary Yu various different of contains with Shang, reached taught and learn two-way learning of spread mode.
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