PubMed® Comprises more than 35 million citations for biomedical literature from MEDLINE, lifestyle science journals, and on the web guides. Citations may perhaps contain hyperlinks to full textual content material from PubMed Central and publisher web sites. 进入课件库：登录成功后，点击页面上的“课件库”选项，进入课件管理页面。 跟踪研究热点：可以通过高级搜索查询某个主题的文献数量变化，... https://usemeupdubai.ae