在源文件中，打印在相同栏内的若干正文行的集合。在当前栏内所剩余的纵向空间放不下既定一段正文时，则这段正文从下一栏开始打印［或印刷］。在单栏格式的情况下，下一栏便是下一页。

In a source document, a collection of lines of text to be printed in the same column. When the vertical space remaining in the current column is insufficient for the block of text, the text is printed in the next column. In the case of single-column format, the next column is on the next page.