DELIMITER：指定用于在分隔的文本文件中分隔字段的字符。
DELIMITER: Specifies the character that separates fields in a delimited text file.
货币分隔符包括千位分隔符、小数点、小数位置、字段长度和填充字符。
Currency separators include the thousands separators, decimal separators, decimal position, field length, and padding character.
字段是一个文本字符串，通过某个字符与其它字段分隔开。
A field is a string of text separated from other fields with a certain single character.
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