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The order is:The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.嬴诗曼何许人也？秦始皇的女儿。《青春同学会》不仅为明星班设计专属“同学村”，开启了一段四天三夜的“时光重现之旅”，还创造综艺+公演的特殊节目形式，为明星班打造独立的专属影棚与舞台，邀请影视戏剧导演亲自指导明星班级在四天内独立完成一部戏剧并进行公演。　　First Certificate of "Newly Established" Wuxi Enterprise: Free; The second card starts with one household and has more than one card: 200 yuan/card/first year (including media); Foreign enterprise certificate: 200 yuan/sheet/first year (including media)讲述某天偶然间共有一个女人感情的一个男人完完全全体会到那个女人身上喜怒哀乐后发生的情感共有奇幻爱情人性推理故事。