On Feb 1, Dr. Lv Zejie returned to our group to visit the teachers and students. Dr. Lv was a PhD student under the supervision of Prof. Xi and Prof. Zhang, focusing on the nitrogen fixation and the chemistry of carbon-rare earth metals. He made significant contributions during his PhD studies. Upon completing his PhD in 2021, he joined Sven Schneider's group at the University of Gottingen, Germany, for postdoctoral research. During his visit, he generously shared his valuable scientific research experience and experimental skills with everyone, greatly benefiting us. Finally, we all took a group photo, creating an unforgettable memory!