The thesis can make situational assumptions. According to the relevant information of the query, in the paper, situational assumptions can be used to construct a certain situation, so as to better explain the research problems or verify the research assumptions. For example, in social science research, situational hypothesis can be used to describe the mechanism of a social phenomenon or simulate the result of a social behavior. In engineering research, scenario hypothesis can be used to simulate the running state of the system or to test the reliability of the system in a specific environment.