Sell, donate, exchange.

1. Some libraries will sell outdated books to readers or other institutions at low prices, so as to recover part of the costs and give readers a chance to buy cheap second-hand books.

2. Libraries will choose to donate outdated books to other institutions, schools, community libraries or charities so that more people can use them.

3. Some libraries will exchange books with other libraries to enrich their collections, make better use of outdated books and obtain new books from other libraries.