In latest years, because of the improvement of telecommunication technology, VOD (video on demand system) is being developed in a high speed which has never been seen.

近几年来，随着通信技术的进步，视频点播系统以前所未有的速度迅猛发展。

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VOD is a very important system for bring people video information. It's running quality direct effects the stability of all other telecommunication operations.

视频点播系统是信息网络的重要业务系统，它的运行情况直接影响到信息传递的有效性和用户的满意程度。

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