Access the root hub through the UsbServices.
通过UsbServices访问root hub。
The root hub is considered as a UsbHub in the application.
在应用程序中root hub就是一个UsbHub。
The program as written simply looks at the root hub for available USB devices, but it would be easy to improve it to traverse the whole USB tree.
这个程序编写为只是查看root hub上可用的USB设备，但是很容易将它改为遍历整个 USB 树。
The basic functionality of USB OHCI root hub is the foundation of the root hub design.
USBOHCI根集线器的基本功能是根集线器设计的基础。
The basic functionality of USB OHCI root hub is the foundation of the root hub design.
USBOHCI根集线器的基本功能是根集线器设计的基础。
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