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.
在允许的地方，分隔数据字段中相邻的子组件。如果没有子组件，该字符将被忽略。
Separates adjacent subcomponents of data fields where allowed. If there are no subcomponents, this character may be omitted.
Fieldnames(字符串)包含要读取的字段的名称，字段之间用逗号分隔。
Fieldnames (string) contains the names of the fields that are to be read with commas between.
对于ASCII文件，您可以指定文件的字段分隔符、转义字符、是否应包括尾随空白，以及文件的编码。
For ASCII files, you can specify the field delimiter for the file, as well as the escape character, whether trailing blanks should be included, and the encoding for the file.
对于ASCII文件，您可以指定文件的字段分隔符、转义字符、是否应包括尾随空白，以及文件的编码。
For ASCII files, you can specify the field delimiter for the file, as well as the escape character, whether trailing blanks should be included, and the encoding for the file.
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