On June 27, Prof. Patrick Holland from Yale University visited our lab. In the afternoon, the students reported the recent work progress to Prof. Holland, and had a lively discussion. Then he visited the laboratory and took a group photo with teachers and students in front of the group overview display board. On June 28, Prof. Holland gave a report entitled "Breaking it and fixing it: new chemistry with nitrogen". We extend our gratitude to Prof. Holland for the visit!