... 结尾空白符 trailing blanks; trailing spaces 空白符号 blank character; clear character; null 伪空白符 pseudo-blank symbol ...
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So for fixed record formats, you'll get the entire record, including trailing blanks.
因此，对于固定记录格式，会获得整个记录，包括末尾的空白。
The rest of the expression is used to see if the value (without leading or trailing blanks) is an empty string.
表达式的其余部分用来检查值(去掉头尾的空格之后)是否是空字符串。
To determine whether a file or a group of text files has embedded control characters, use these options. For instance, if a file has trailing blanks, you can see them
若要确定某个文件或某一组文本文件是否有嵌入的控制字符，可以使用这些选项。
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