本实用程序仅可用于根组件属性，不可用于其他组件，如子组件。

This utility can only be used on Root component attributes, and cannot be used on other components such as child components.

youdao

既然您知道了第一个组件必须是根组件，那么如何确保正确的组件是第一个组件呢？

Now that you know that the first component has to be the root component, how do you ensure that the right component is the first?

youdao

呈现mvc样式视图的页面；页面通过JSF组件树引用视图根(view root)。

Pages that represent MVC-style views; pages reference view roots via the JSF component tree.

youdao