A Device can be accessed directly from the Host with its PortIdentifier, or can be found by traversing the USB Bus starting from the root hub.
可以用一台Device的PortIdentifier直接从Host访问它，也可以通过从roothub开始遍历usbBus找到它。
A Device can be accessed directly from the Host with its PortIdentifier, or can be found by traversing the USB Bus starting from the root hub.
可以用一台Device的PortIdentifier直接从Host访问它，也可以通过从roothub开始遍历usbBus找到它。
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