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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.Add a method called set_number_served (), which allows you to set the number of people to eat. Call this method and pass a value to it, then print the value again.主要講述中文老師盧文達（劉俊謙飾演）奈何教績強差人意，教學生涯一直徘徊在淘汰邊緣。同時校長（智叔飾演）計劃將學校轉為直資學校，而出身清貧、曾受惠於學校創辦人有教無類宗旨的林副校（秀雯飾演）認為此舉有違書院的辦學理念，不想讓學校變成貴族學店而設法阻止。於是她以轉長約為條件成功威逼利誘盧文達為她效命，暗中施計企圖拉倒轉直資的方案。1947年，中共苏宁特委联络员桑义州调往吴兴县委担任武装部长。没想到，几乎与他同时，县委又来了一位桑义州！县委的人虽然听说过桑义州的名字，却无人认识，一时真假难辩。这时，潜伏在敌人内部的地下党发来密电：特委被国民党军队偷袭，包括孙书记在内的所有同志都壮烈牺牲，仅侦察科长梁伟被俘。"One morning, I got up and suddenly found that there were only a few messages in each group. At that time, my heart thumped."在押注他将买入Ondays之后，田中已成为总统，在陷入各种绝望的困境（例如背叛和田中（Tanaka）破产破产）的过程中，这种策略可以说是毁灭性的，银行已宣布Ondays“绝对破产”。 它基于遭到反对的真实故事。 朝日电视台2020年1月3日至1月5日播出的新年3夜戏剧