The graduation defense of the 2021 Ph.D. and M.S. students was held on May 25, 2021 in A331. The Ph.D. student Zhang Na and the M.S. students Hou Shuai, Cheng Kai, Li Jing Shuai, Yang Xiaodong and Hu Binxing all passed the defense successfully. We wish you all the best of luck in your research, career and happiness!