There are three different pieces of information you need from each line: the seven-digit customer number, the customer name, and the single character customer type.
您需要从各行获得三项不同的信息：七位数的客户号、客户名以及单个字符的客户类型。
To understand what these pieces mean, consider an optical character recognition system that scans glyphs printed on paper and converts them into three-digit decimal Numbers.
要理解这些部分的具体含义，请考虑一个光学字符识别系统，该系统扫描纸张上的符号并将它们转换为3位的十进制数。
Later, metal pieces were used, with one character on each.
后来，采用了金属片，也是每一片上有一个字符。
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