My tutor, Professor Zhao, helped me to determine the topic of the paper and the operation steps of the experiment, and also helped me find a lot of materials and books. exist

In the process of opening the topic and writing the paper later, he gave detailed guidance. Many teachers in the School of Foreign Languages of Northwest Normal University are very kind to me.

In particular, Professor Wu Heping, Professor Cao Jin and Professor Jin Yan gave guidance. Many of my colleagues in Yuzhong Normal University, especially Zhang.

In the process of doing experiments and writing papers, Teacher Wei Ping gave me a lot of support and help.

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