Reason: Because there are two formats when downloading papers from HowNet: pdf format and caj format. Pdf format can be opened with wps, word or other pdf readers, but papers downloaded in caj format need special caj readers to open and read. So when downloading the paper, choose any one according to the actual situation of your computer.
1. Select pdf format to download: After finding the desired article on HowNet, click the title, as shown below, and select pdf to download and save (at this time, it can be opened as long as the computer is equipped with WPS, Word or other PDF readers).
2. Select caj format to download: After finding the desired article on HowNet, click the title and you can see the following contents. Select cajg format to download and save (at this time, the computer needs to install caj reader to open).
Knowledge expansion: caj reader is a product of Beijing HowNet Company, which is used to read and edit the literature of HowNet database.