In order to facilitate users to specify the temporal specification at the time of authoring a multimedia program, a composition model is needed.
为了方便用户编制大型多媒体系统的时序描述，组合模型是必须的。
In order to facilitate users to specify the temporal specification at the time of authoring a multimedia program, a composition model is needed.
为了方便用户编制大型多媒体系统的时序描述，组合模型是必须的。
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