Each component instance gets its own injector and an injector at one level is a child injector of the injector above it in the tree.
每个组件实例获得了它自己的注入器，并且每个级别上的注入器都是它上级节点的子注入器。
There is a tree hierarchy of injectors, with a root injector and an additional injector for each component.
有一组树状多层注入器，有一个根注入器，每个组件也另外有一个注入器。
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