All whitespace in character content is retained (excluding characters removed during line feed normalization).
保留字符内容中的所有空白(不包括换行规范化过程中删除的字符)。
Printers recognize the form-feed character and automatically advance the print head by the required number of lines necessary to begin the next line of data on a new page.
打印机会识别换页符并自动根据在新的页开始新行所需的行数移动打印头。
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