The tag tap:aio is used to represent a logical disk based on the image file, while the tag phy represents a physical disk.

标记 tap:aio 用于表示基于镜像文件的一个逻辑磁盘，而标记 phy 表示一个物理磁盘。

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The PHY (physical layer) provides the electrical and mechanical interface between the device and the cable and ensures that all devices have fair access to the bus.

物理层为设备提供了一个物理和电气接口，保证总线上的所有设备都能公平地访问总线。

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This algorithm combined sub-carrier allocation in the physical(PHY) layer with traffic scheduling at the data link layer (DLL) by employing the channel state information.

利用物理层的信道状态信息，该算法将物理层（PHY）的子载波分配同数据链路层（DLL）的数据包业务调度结合起来。

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