The research methods used in this paper are literature method, observation method, theoretical research, online query and other research methods. For example: collecting information online, checking materials in the library, writing papers, investigating and interviewing, etc. First of all, search for the information and literature related to the subject, through reading a series of materials and literature, to achieve a comprehensive understanding of the subject, and make basic preparations. Secondly, the most useful information can be obtained in a short time through interviews, which provides necessary help for writing papers
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