Reading data streams and writing results to streams is convenient, because the application does not have to read a large portion of the file, much less the whole file, into memory.
读取数据流并将结果写入流是很方便的，因为应用程序不一定要将文件的大部分（更不必说整个文件）读取到内存。
This allows drivers to communicate with their devices by writing to and reading from memory.
这使可以使驱动程序通过存储器写入和读入来和硬件设备联系起来。
Coming up we'll look at memory mapping, how file reading and writing ties into all this and what memory usage figures mean.
进而我们会看看内存映射原理、与之相关的文件读写机制以及内存使用情况图表所揭示的含义。
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