On April 12, Prof. Nicolas Mézailles from the University of Toulouse III introduced his work in the field of nitrogen fixation at the first International Symposium on Air Key Component Transformation held in Shanghai. On the afternoon of April 18, Prof. Mézailles visited our lab. The students reported the recent work progress to him, and Prof. Mézailles had a lively discussion with the students. Finally, we took a group photo together.