This is why certain policies described later in the article, such as layout, component, and theme policies, can be defined at any level of the hierarchy of the device tree.

这就是某些策略在文章的后面才介绍的原因，像布局、组件、主题策略，这些都能被定义在设备树状图中的任何层次。

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They have been classified by component, layout, and application, and — depending upon your role — may not all be applicable.

这些模式可以按照组件、布局和应用程序以及角色分类，可能并不完全适用。

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Aggregation USES the concept of templates for window, screen, and component layout to allow for more flexibility when customizing.

聚集把模板概念用于窗口、屏幕和组件的布局以增加定制时的灵活性。

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