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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.The anterior palm of the foot is also thickened.永平帝本当前年就要升迁其回京的，因岷州一向贫瘠，为免许多举措功亏一篑，才命其连任。Therefore, when designing AI-based defense, you need to consider the following facts:Musician Cat Power narrates this documentary on Janis Joplin's evolution into a star from letters that Joplin wrote over the years to her friends, family, and collaborators.微型传说的战斗已经过了十年。