https://ridnt-b.blogspot.com/2018/01/adobe-reader-2018-free-download.html
http://ardownload.adobe.com/pub/adobe/reader/win/AcrobatDC/1900820071/AcroRdrDC1900820071_en_US.exe
如何查看目录,左侧栏,第二个图标是目录。叫做Bookmarks