此示例使用一个固定长度为70字节的纯文本消息，且具有以下结构。

This example USES a 70-byte fixed length flat text message with the following structure.

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小型传输，开销很小(固定长度的头部是2字节)，协议交换最小化，以降低网络流量。

A small transport overhead (the fixed-length header is just 2 bytes), and protocol exchanges minimised to reduce network traffic.

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要把数据表中的相似重复记录标识出来，常用的方法是先将所有记录按照某个关键字进行索引，然后在一个固定长度的窗口范围内进行记录的两两比对。

The common approach of marking the approximately duplicate records is that a pair of records are compared in a window with fixed length after these records are indexed by a certain keyword.

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