这意味着不必将整个文件读取到内存中才能着手处理文件。
This means that the whole of the file does not have to be read into memory before processing of the file can commence.
CPU Usage History的大型峰值说明文件读取到内存后的执行了处理动作。
The large spike in the CPU Usage History shows the processing that occurs after the file has been read 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。
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.
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