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Historical research is a very meaningful research method. This method has advantages that other methods do not have. For example, people are usually interested in past events, and interest is indispensable for researchers. In addition, historical research is flexible, that is, it does not require a fixed time and is not limited by personnel factors. It can fully combine personal interests and hobbies, thus facilitating the development of research. However, historical research also has limitations. Because history is irreproducible. Therefore, it is impossible to determine whether the same results will occur in the new situation and whether the same conclusions will be drawn as in the old situation. In addition, historical data are often difficult to collect completely, and their validity is difficult to judge. These limitations are probably related to people's own limitations.