为何我选定的文本没有被正确复制？

If you highlight and copy text from a document using Document Viewer and then paste it into another application, the formatting may alter. It may also contain different characters than the original selection. This often happens when copying text from a PDF document with multiple columns.

发生该问题是因为一些文档格式处理文本的方式。在文档中的实际文本与显示出来的并非一致。这就导致了复制的结果与期望的不一样。

Unfortunately, there is no real way of fixing this problem. Copying less text at a time, or copying the text into a text editor (like gedit) may minimize the problem.