本文的第一个贡献是，我们研究了在相邻关键帧时间跨度较大时的等级预测结构中，传输差错对重建图像质量的影响。

In the first contribution, we address impacts of transmission error in quality degradation for hierarchical prediction structure in which the gap between two key pictures may be large.

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这些层可以被动态的增加或删除，你也可以对这些层进行改动，因为每层都有一个轨道，你可以在轨道中的特定时间点加入关键帧到达改变动画的目的。

These layers and be added or removed dynamically and you can change each layer as it has a track that lets you change it as a function of time by inserting keys at certain frames in the track.

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如果你要编辑一个关键帧，你要先选中节点，然后把时间标记移动到关键帧的时间点上。

You edit a specific keyframe of a node by moving the time marker to the time of the keyframe and selecting the node.

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