I am in contact with the collection for a short period of time, for more than two years, or not of interest, but feel that it requires a very professional knowledge base, that it is busy and that it is not time-consuming. Until 2020, when the epidemic was isolated at home, the collection path was finally set under the guidance of friends. It was understood at the beginning of the day, but it was felt that the collection was a mysterious one and that it was simply not known where to get down. ...