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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.　大分裂时期，各国纷争，狼烟四起。大魏国为了抢得军粮，频频来犯大齐国。女主人公小小苏刚一出生就被敌国下了毒咒，会在每晚子时发出男人的大笑声不止。为了破除咒语，老道长送给她一块奇石，让她去找左胸有胎记的男人，如若胎记遇奇石发生反应，赶快吻下去，方可破除咒语保住性命。但如若吻错，则加速死亡进度。加拿大CBC新喜剧《上班族妈妈》是一部典型的女性剧，女人是否能拥有想要的一切？对这些上班族妈妈来说，有些时候她们的确能心想事成，但有些时候……一事无成。有了这批复。"These DDoS attacks have become very sensitive topics and we cannot discuss them publicly now," said CISO of a medium-sized bank in the Pacific Northwest.他们顿时紧张起来，无声无息地潜在水底，不敢在河中央游动，只靠近岸边。