KDM和每一个播放列表相关联，规定正确的投影开始和结束时间。
A KDM is associated to each playlist and defines the start and stop times of validity for the projection of that particular feature.
KDM和每一个播放列表相关联，规定正确的投影开始和结束时间。
A KDM is associated to each playlist and defines the start and stop times of validity for the projection of that particular feature.
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