图书管理系统，借书、还书、权限管理、用户管理、信息修改、密码修改等功能(authority; power; within the power or right of
manage; supervise; administrate; Administration
user management; user administration
information; message; info; news; communication
revise; amend; alter; modify; make over
password; cipher code; cryptogram; steganogram
function)