Open the "National Intelligent Education Platform for Primary and Secondary Schools" (/), select "Course Teaching"-"Textbook Area", then select information such as learning period, subject, version, grade and volume, and click the corresponding textbook to display the textbook normally.

After the textbook page can be displayed normally, right-click on the page and select the review element.

Click Network (or Network) and Get /XHR in the new window, and then refresh the browser page.

A pile of files will appear in the window on the right. We find pdf.pdf, then right-click the file and "open in a new tab". The browser will open this pdf file in a new tab.

There is a download button in the upper right corner of this new label. Click on it to download this pdf file. Remember to modify the file name after downloading.