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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.　　康熙因山西受灾，又在大街上见到被拐卖的山西小姑娘，动了去山西私访之心，路上见一镖局招镖为皇上保送秀女，康大怒，为查清真相扮成镖手接镖，巧遇与宜妃相像，同来接镖的林风儿，二人达成协议，共同保这趟镖。2008年1月26日到2月5日，突如其来的寒潮使花城广州呈现一片北国风貌。数十万旅客滞留在广州火车站，故乡在召唤每一个游子的心。The probability of understanding can be improved through many skills, or through the weapon's own understanding, the weapon's customized enhancement, and the cat or teammate playing the flute (15%)杨长帆精力倒是旺盛，很快将钱打好了捆，拢共67贯三千八分，就算67两吧。To this end, Osaka Weaving House joined hands with Nishimitaro, a Japanese MD (Commodity Sales Plan) expert who has coached MUJI and ZARA brands, to re-organize the entire commodity sales plan and promote the establishment of a flexible supply chain.