时光如白驹过隙，转眼间我的大学时光已经接近尾声，回首我这大学四年，感谢

时光如白驹间过缝隙，转眼间我大学大学时光已经尾声尾声回首我这大学四年四年感谢感谢这遇到的和和同学感谢感谢他们我我帮助。篇文章写完，在论文的写作过程中也遇到了一些和和错误但是我在一个和同学的下完成了。特别要感谢我的论文指导张宗元元，他对对我进行指导，帮助，又帮助老师，我进行论文的修改，老师老师工作的有多少，有多少，总是总是把把把的先找好，对我的论文进行了。。。还有不懂的地方我都在校图书馆进行资料的查找。在写论文论文论文过程中对我思想上的写作过程中。同时也感谢我的同学和朋友，在写论文论文的写作过程中提供了帮助帮助。地方，恳请恳请老师的和批评批评

Time is like a fleeting moment. In the twinkling of an eye, my college time is coming to an end. Looking back on my four years of college, I thank the teachers and classmates I met along the way and their help. After several months, I finished this paper. I also encountered some difficulties and obstacles in the process of writing the paper, but I completed it with the help of a teacher and classmates. In particular, I would like to thank my thesis instructor, Mr. Zhang Zongyuan, who gave me selfless guidance and help and helped me revise my thesis again and again. No matter how busy the teacher's work is, as long as he finds a teacher at any time, he always puts his own affairs aside and guides my thesis. In addition, there are places I don't understand. I search for materials in the school library. Here, I am very grateful to the teachers who have helped me and guided me. They not only helped me in action, but also inspired me in thought in the process of writing my paper. At the same time, I also thank my classmates and friends for their enthusiastic help in the process of writing my thesis. Due to my limited academic level, there are inevitably some bad places in my thesis. I beg your guidance and criticism!<br>