Today's dissertation is completely different from the past air-to-air, but it should be truly justified. No matter quantitative analysis or qualitative research, there must be evidence basis. Not only witness testimony, but also multi-source evidence.

For second-hand materials, we should use authoritative latest data to show powerful information. This can also reflect whether the author is an expert in this field, because if there is no even the most authoritative source, it is difficult to convince people by relying on WeChat official account, Baijia number and other sources. The analysis of data should also be reversed, from multi-dimensional, multi-level and multi-angle analysis, rather than pouring it all out at once.