The library will continue to purchase new resources. As for those old resources whose value or utilization rate is not particularly high, they will be discarded regularly, or put into the library and no longer circulate. Abandoned resources may not all stay in the library, it depends on how the library handles them, and some are sold. In theory, it is necessary to eliminate the old ones, but in fact, many libraries have not done well. For example, I know many university libraries. Before, because of the evaluation, the number of collections could not meet the requirements, so I went shopping. In that case, it is impossible to get rid of the old one.

I wonder if you are satisfied with my answer, is it the part you want to know?