For example, a USB 2 PCIe host controller card that presents 4 USB "Standard A" connectors typically presents one 4-port EHCI and two 2-port OHCI controllers to system software.
举例来说，提供4个USB“标准A”连接器的USB 2 PCIe主机控制器卡通常会向系统软件提供一个4端口EHCI和两个2端口OHCI控制器。