On the stratification of reliability articles

The first part is divided into three layers:

The first floor: {1-2 natural section} The reason for the writer's personal relationship with Mr. Lu Xun. I explained the time, place, author's status and the cause of the incident. In short, I ran into the bookstore because of hiding from the rain.

The second floor {3- 17 natural section} describes the warm reception of Neishan's boss and the author's difficulty in buying books.

The third floor (18-37 natural section) describes the author's brief and wonderful encounter with Mr. Lu Xun, which is really fortunate. This floor is the main body of the article.