这当然是可行的，但设置藏得很深！系统附带了一些默认的水印 PDF 文件，您也可以制作自定义的 PDF 并应用它。
顺便说一下，下次您寻找设置时，请尝试对话框底部的“Search for settings”（搜索设置）工具：
选择其中一个选项会直接带您到该设置并为您高亮显示。
That’s certainly possible, but well hidden! There are a few default watermark PDFs included, or you can make a custom PDF and apply that.
By the way, the next time you are looking for a setting, try the “Search for settings” tool at the bottom of the dialog:
Selecting one of those options till take you straight to the setting and highlight it for you.
机器翻译自 English
