保存一份注释过的 PDF 的副本
To save a copy of your annotated PDF for future viewing using the Document Viewer or any other PDF viewer that supports annotations:
Click File options ▸ Save As…
选择一个文件名以及要保存文件的文件夹，然后单击 保存。该 PDF 将保存在您选择的文件夹内。
Annotations are added according to the PDF specification. Therefore, most PDF readers should be able to read them. Adobe Reader is known to work.