Visiting pubmed as a university does not mean that there are any documents in pubmed, but after searching in pubmed, if the articles are included in the full-text database, the full-text link icons will be given in the upper right of most articles. Clicking this icon will link to the corresponding full-text database as the university. If this university has purchased the copyright of this article in the corresponding full-text database, it can be downloaded. For example, if you find an sd document, click the pubmed entry to give the full-text link icon, and you will enter sd as this university. If this university has the right to publish this article, you can download it.