After school, Xiaoming reads books in the library to enrich his knowledge. The sentence "Xiao Ming reads in the library after school to enrich his knowledge" describes Xiao Ming's activities and behaviors after school. "After school" means time, "Xiaoming" is the subject, "in the library" is the adverbial of place, and "reading" is the predicate, which is used to express Xiaoming's behavior. Through this sentence, we can understand that Xiaoming likes to go to the library after school, which is a positive habit and can promote personal growth and learning progress.