Xiao Chen was refused entry to the ancient book library by the staff because he did not have the status of a graduate student  Xiao Chen showed the pass of the rare book library of ancient books and said: According to the regulations, I can enter the ancient book library
The rule of it is that non-graduate students are not allowed to enter the ancient book library, and only those who have a pass for the pass of the rare book library of ancient books can enter the rare book library of ancient books
If you have a pass of the rare book library of ancient books, you can enter the ancient book library.