The root interface in the collection hierarchy.

集合层级的根接口。

youdao

Notice how the root element of this message is equal to the global element definition we looked at earlier in the service interface file.

注意，此消息的根元素相当于我们先前在服务接口文件中看到的全局元素定义。

youdao

This article explained at the root level how composite applications can be built and then aggregated into a single user interface.

本文在基础层面上讨论了如何构建复合应用程序再将其聚合到单个用户界面中。

youdao

The system asks the top-most full-screen view controller (typically the root view controller) for its supported interface orientations whenever the device rotates or whenever a view controller is presented with the full-screen modal presentation style.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog