USB作为一种新的PC机互连协议，因其诸多优点，有逐渐取代RS 232串口，成为计算机和外设标准接口之趋势。
USB is a new PC interconnection protocol and has many advantages, It is a tendency that USB replaces the RS232 as computer and peripheral standard interface.
USB作为一种新的PC机互连协议，使外设到计算机的连接更加高效、便利。
USB as a new PC protocol makes the connection between the PC and peripherals much more efficient and convenient.
USB作为一种新的PC机互连协议，使外设到计算机的连接更加高效、便利。
USB as a new PC protocol makes the connection between the PC and peripherals much more efficient and convenient.
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