说明：  本系统采用会员制管理，系统功能应包含进书管理、售书管理、退货管理、库存管理、统计分析、相关人员管理等。系统界面力求简洁、易用，在标准化的基础上考虑界面的美观和新颖。
(the system adopts a membership system management, system functions should include management books, Books management, return management, inventory management, Statistical analysis, relevant personnel management. System interface concise, easy-to-use, standardized interface based on consideration of aesthetics and novelty.)