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设计并实现了一种经济实用的视频／音频点播系统──并发下载式点播系统，将ＶＯＤ与分布式数据库相结合，实现了在常规配置下的视频／音频点播．
A cost-effective video / audio on demand system is designed and implemented, which is a concurrent download-on-demand system that combines VOD with a distributed database to achieve video / audio on demand in conventional configurations.