To copy the text from the PDF-file, you can use some PDF-editing software or online tools. The following are some common methods: 1. Use a PDF-editing software: For example, you can edit and copy the text in a PDF-file with software such as Adobe Acrobat, Gimp, Word Processing, etc. In the software, select the text that needs to be copied and then click the right mouse button to select "copy" to copy the text to the whiteboard. 2. Use online PDF-Tools: Tools such as PDFSam, PDFBox, PDFminer, etc. can also be used to edit the PDF-files. Open these tools in the browser, select the PDF-file, then click the right mouse button and select "copy" to copy the text to the whiteboard. 3. Use the command-line tool: You can also copy the text in the PDFimport file to the whiteboard by typing commands such as " PDFImport "," PDFunite ", and " PDFrewind ". It is important to note that before copying the text, you should first back up the original PDF-file to avoid unexpected situations. At the same time, for some special PDF-files, you may need to use different tools or methods to copy the text.