This containment hierarchy doesn't exist in every business domain context.
该容器层次结构并不存在于每个业务域上下文中。
To appear onscreen, every GUI component must be part of a containment hierarchy.
GUI组件需要在屏幕上显示，必须是控制层次的一部份。
A containment hierarchy is a tree of components that has a top-level container as its root. We'll show you one in a bit.
一个控制层次是一个拥有一个顶层容器作为它的根的树组件。
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