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.
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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