为了方便用户，4versa自动抓取源文件根元素内的所有名称空间声明。
4versa automatically grabs all the namespace declarations within the root element of the source file as a convenience to the user.
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，也许最好以某种格式为标准然后将所有传来的视频都转化成这种格式。
To make it easier on the customer, it's probably best to standardize on a particular format, and then convert all the incoming video into that format.
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