它使用以“From”开头的行作为消息分隔符；这是可以修改的，但是用它就足够了。
It USES a line starting with "From" as a message separator; this could be adapted, but it works well enough.
输出的前三行将被忽略，因为它们分别包含分隔符、标题信息和最新的平均值。
The first three lines of the output will be ignored because they contain delimiters, header information, and recent averages, respectively.
分隔的ASCII (DEL)文件是ASCII字符流；数据流中的行由行分隔符分隔，而行中的列值由列分隔符分隔。
A delimited ASCII (del) file is a stream of ASCII characters; rows in the data stream are separated by row delimiters, and column values within a row are separated by column delimiters.
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