Time flies like arrows, sun and moon flies like a shuttle, unconsciously I have spent more than two years of university time in Huazhong University of Science and Technology. During the period, with the care and help of teachers and classmates, I enriched my knowledge, expanded my horizons, and improved my abilities, which laid the foundation for my future study and development. Here I would like to thank my mentor especially. He gave me selfless teachings on academics and deep care in life. At the same time, I would like to thank all the teachers and professors of Huazhong University of Science and Technology who have taught, cared about, and helped me. They have given me more opportunities to try to think from a new starting point in theory and practice. Here, I would also like to thank all the classmates and friends I met during my studies for their help. Finally, I want to thank my parents, who have been silently supporting me behind my back.