It has been a long time since I knew and visited the SCIENCENET.CN the first time. But, I have not written something here, because in my mind everyone here just like my teacher, and I learn a lot from the teachers, for example, Professor Wang Dehua, Wu Yishan and Zuojun Yu, etc. Today, I write an article here, not to tell my deep thoughts about something, but to thank the teachers who shared a lot of knowledge, experince and opinions, and thank SCIENCENET.CN. I will keep focusing and learning from SCIENCENET.CN.