计算机并口主要用来连接打印机，由于数据并行传输，所以传输速度相对较快。
The parallel port of computer is mainly used for connecting to printer, the data transmission rate is rapid because the data is transferred in parallel.
此外，在US B家族中还包括USB接口的打印机，它越来越普及并且有取代针式打印机和并口打印机的趋势。
In addition, the USB family also includes USB printer, it is becoming more and more popular and presents the trend to replace the stylus printer and the parallel port printer.
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