Through this stage of efforts, my graduation thesis tries to listen to how to spend.

Finally finished.

Finally finished.

First of all, I would like to thank my tutor, Mr. Jia, for his guidance from topic selection to thesis writing. I sincerely thank you for your great efforts in your paper.

First of all, I would like to thank my tutor Jia, for your guidance from topic selection to writing, and for incorporating the shadow of blood into my thesis.

Although Mr. Xie did not directly participate in my thesis guidance, he also gave me a lot of advice when opening the topic.

Although Mr. Xie did not directly participate in my thesis guidance, he also gave me a lot of advice.

In the process of designing and writing this paper, I got your careful guidance and help, and took time out of my busy schedule to guide my paper.

In the process of designing and writing this paper, I got your careful guidance and help, and took time out to guide the paper for me.

The teacher took pains to guide me how to choose a topic, how to find information, how to enter the topic and how to write, and put forward many valuable opinions and suggestions.

The teacher took pains to guide me on how to find information, topics and writing, and put forward many valuable opinions and suggestions.

Not only did I write pertinently in the limited time of internship, but I also realized the teacher's profound theoretical level and rigorous academic attitude, which will definitely benefit me a lot!

Not only let me write targeted in the limited internship time, but also realize the profound theoretical level and rigorous academic attitude of the teacher, which will benefit me a lot!

In my three years of college life, I have been constantly concerned and helped by teachers and classmates, which has given me the warmth and care of friendship in my study and life. The most important thing is a kind of spiritual encouragement, which makes me very moved.

In the three years of college life, I have been constantly concerned and helped by every teacher and classmate, which has made me feel warm with friendship and care in my study and life. The most important thing is a spiritual motivation, which makes me very moved.

Finally, I would like to express my gratitude to all the teachers who took time out of their busy schedules to review, comment and participate in my thesis defense.

Finally, I want to take time out of my busy schedule to say thank you to this paper and my dear teachers who participated in the paper review.