Point-surface combination. The fourth paragraph of "Small Lens in the Library" describes how the representatives of men, women and children read books carefully. With the combination of point and surface, readers can feel that everyone loves reading, and they can also feel that they are serious and have a sense of hierarchy. The article "Small Lens in the Library" is selected from the Chinese textbook of grade five in primary school. The full text describes the small lens in the library realistically through delicate brushstrokes.