The USB protocol is strictly hierarchical.
USB协议有严格的层次结构。
There are four types of data transfer in the USB protocol.
有四种类型的数据传输的USB协议。
USB protocol has four transfer types: Control transfer, Bulk transfer, Interrupt transfer, and Isochronous transfer.
该协议具有四种传输方式，即控制传输、批量传输、终端传输和等时传输。
The protocol of USB is researched.
研究分析了USB协议。
The protocol of USB is researched.
研究分析了USB协议。
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