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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.大战迫在眉睫，再拖下去，天气炎热。元朝末年，此起彼伏的反抗运动时有发生，江湖上也是风起云涌，暗藏杀机。一百多年来，武林中人都在争夺倚天剑、屠龙刀这两件武林神器，江湖传言武林至尊，宝刀屠龙，号令天下，莫敢不从，倚天不出，谁与争锋。倚天剑落在峨嵋派掌门灭绝师太手中，后屠龙刀亦为明教护教法王金毛狮王谢逊夺得，惟有两件神器一并在手才可雄霸天下。武当派弟子张翠山夫妇因刀惨死，其中张无忌机缘巧合习得九阳神功，并卷入了这场武林是非中。老太太愣了一下，然后开始恨他了，就不该松口的。We will prepare two evening programs for the villagers, including Indian dance, drama, solo, etc., to further meet the cultural needs of the broad masses of farmers.Delete the rule according to the rule sequence number, delete the specified rule of the specified chain of the specified table, and the-D option means delete the rule in the corresponding chain.