What is the structural function of the third paragraph of Forever Campus?

The role of connecting the preceding with the following. Here, the author moves from the concrete campus to the abstract campus. Xie Mian is a poet and a poetry critic. 1955 was admitted to Peking University and has been teaching there since graduation. He used to be the director of China Institute of Language and Literature in Peking University, the director of Peking University Institute of Chinese New Poetry, and the editor-in-chief of New Poetry Review.