源文件的用法和樣例：
例句
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在源文件中，列印在相同欄內的若干正文行的集合。在當前欄內所剩餘的縱向空間放不下既定一段正文時，則這段正文從下一欄開始列印［或印刷］。在單欄格式的情況下，下一欄便是下一頁。
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.
