外部设备的数据传输速率通常比CPU的数据传输率更慢，相应的，需要一种同步机制。
The data transfer rate of peripherals is usually slower than the transfer rate of the CPU, and consequently, a synchronization mechanism may be needed.
外部设备的数据传输速率通常比CPU的数据传输率更慢，相应的，需要一种同步机制。
The data transfer rate of peripherals is usually slower than the transfer rate of the CPU, and consequently, a synchronization mechanism may be needed.
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