说明：  酒店管理系统的主要功能包括以下几个方面：员工管理、客房类型管理、客房管理、酒店营业状况统计、客房预定、结账退房。
(Hotel Management System main functions include the following: staff management, the management of room types, room management, hotel business conditions to statistics, hotel reservations, check-out bill.)