直到最近，PC的输入输出设备做得最好的还是通用接口总线（GPIB），而它已经用了几十年了。
Until recently, PC I/O couldn't outperform the general-purpose interface bus (GPIB) we've been using for decades.
其中数据总线sda是一个双向引脚，用于输入或输出数据。
Which the data bus SDA is a bidirectional pin used for input or output data.
总线连接电脑设备：如多个处理机，输入及输出设备等等。
Buses connect computer devices, such as processors, input and output devices, etc.
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