A library is an institution that collects, sorts out and collects books and materials for people to read and refer to. As early as 3000 BC, libraries appeared. Library has the functions of preserving human cultural heritage, developing information resources and participating in social education. Library is the external storage and selective transmission mechanism of social memory (usually expressed in written records). In other words, the library is the memory device and diffusion device of social knowledge, information and culture.

When readers need to extend the borrowing time of borrowed books, they can only renew them if there is no reservation from other readers. But the regulations in each place are different. Ask the local librarian.