导航特性允许在元素中移动，甚至可以移动到下一个故障点以定位不符合您的DTD的标记。
Navigation features allow you to move among elements and even move to the next-trouble-spot to locate markup that doesn't conform to your DTD.
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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