Liu Guojun's 3+4 bachelor's degree means that Liu Guojun participated in the 3+4 master's and master's programs in cooperation with the University of Illinois at Urbana-Urbana-Champaign in Nanjing University of Information Science & Technology, and completed the undergraduate and master's studies, and obtained the corresponding degree certificates. This kind of project can usually shorten the study time and improve students' academic level and employment competitiveness.