USB设备树查看器能够查询注册表，并列举主机控制器，集线器根，以及连接设备每个端口。
USB Device Tree Viewer is capable of querying the registry and enumerating host controllers, root hubs, as well as the attached devices to each port.
USB OHCI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.
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