Open transmission of information. The library's cultural knowledge resources are always richer than anywhere else, which also makes its opening provide us with rich learning content. Transferring knowledge is also the mission of the library. Although many documents can be consulted online due to the rapid development of the network, many professional and ancient books are also electronic documents provided by the library. Because the library keeps these most original materials. Many libraries are open to the public free of charge, which is a good place for us to rest in our leisure time, where we can get knowledge for free.