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背景
我打开一个pdf文件，没有显示出pdf的内容，反而出现了下面的一段英文：
Please wait...
If this message is not eventually replaced by the proper contents of the document, your PDF viewer may not be able to display this type of document.
You can upgrade to the latest version of Adobe Reader for Windows®, Mac, or Linux® by visiting http://www.adobe.com/go/reader_download.
For more assistance with Adobe Reader visit http://www.adobe.com/go/acrreader.
Windows is either a registered trademark or a trademark of Microsoft Corporation in the United States and/or other countries. Mac is a trademark of Apple Inc., registered in the United States and other countries. Linux is the registered trademark of Linus Torvalds in the U.S. and other countries.
原因
某家公司的软件生成的pdf文件，必须用该公司的pdf软件才可以打开。
解决办法
1、下载Adobe Acrobat Reader软件：
https://acrobat.adobe.com/cn/zh-Hans/acrobat/pdf-reader.html
2、用软件Adobe Acrobat Reader即可打开PDF