In this case, it is necessary to find out whether the library staff took it away and put it on the shelf. Because if it is on the shelf, you can take it back, return it or take it away. If not, you should find the staff to explain clearly in time so as not to let others take it by mistake.

Sichuan Normal University, referred to as "Sichuan Normal University", is located in Chengdu, the capital of Sichuan.