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。
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。
These include convenience methods for reading and writing text-based files, significantly faster directory enumeration, and support for memory mapped files.
包括读写文本文件的便捷方法，快速地列举目录，对内存映射文件的支持。
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