The meaning of "all-in-one card" in Beijing Public Library means that cardholders can borrow books from the library with their cards, and the borrowed books can be borrowed and returned from the library. Fengtai Library is a lending library. Therefore, overdue books (except periodicals) borrowed by Capital Library can be returned in Fengtai Library. For the specific list of libraries that can be borrowed and returned, please refer to the list of all-in-one-card networked libraries at the bottom of the homepage of Capital Library.