仅仅通过模型导航很难追踪这类层次关系。
This sort of hierarchical relationship is difficult to trace by just navigating through the model.
现在可以开始查看这些组件的运作，并开始创建模型导航插件。
We are now ready to see these components in action and begin to create our model navigation plug-in.
有时候，通过大型模型导航并找到一个对象和另一个之间的关系是一个难题。
Sometimes, navigating through a large model and finding relationships between one object and another becomes a challenge.
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