The author has no lower limit for taking Chinese classes YY... There are many historical bugs during this period. Please feel free to report them...
[But as for the issue of Ying Zheng's personal evaluation and character, I will not care about it here for now. It can be regarded as a article a year ago. There were a lot of bugs when I wrote it. It is too late to fix it now. I will correct it when I have time. Now I am working hard to do textual research... In the end... Please forgive me for the bugs]