I would like to offer my heartfelt

I would like to offer my heartfelt thanks to the teachers, friends and relatives who have enthusiastically helped me with the thesis. It is precisely their invaluable guidance and selfless help that enable my essay to be finished.To begin with, I would like to thank my supervisor, professor Wang Zhao, for his guidance, instruction, encouragement, patience and support. From the topic selection to the paper framework and content arrangement, the teacher gave careful guidance throughout the whole process. The lines of this article are full of profound knowledge, rigorous style of study and skilled technology. Every word and sentence is imbued with the teacher’s concern and love for me, which makes me moved forever.Finally, I would like to thank my friends in particular for their selfless dedication, understanding and support, so that I devote myself wholeheartedly to the writing of papers. Without their help, I would never have come to the present. Teachers often teach students to “pay rigorously”, and I firmly believe that “no pains, no gains”. Only “pay rigorously” can we expect the joy of harvest.