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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.桥本环奈将主演AbemaTV日剧《一页的恋爱》，这也是桥本环奈首次主演电视连续剧！《一页的恋爱》描绘了喜爱绘画的主人公水濑明（桥本环奈饰），和“命运的初恋”森田郁巳（板垣瑞生饰）、“总是在身边的青梅竹马”乾大和（滨田龙臣饰）、“充满刺激的成年男人”星野有利（古川雄辉饰），这3种完全不同类型的男性之间展开的纯真爱情故事。　　他究竟来自何方，他是否脑袋出了毛病，他爱颐指气使，爱捉弄人，爱逞威风，行为带点怪诞，他的性格，他的举止，不知道为甚么，总显得The defendant was also taken to North District Hospital, during which she lied to the police that the victim suddenly twitched and then cut open her stomach with a knife. 　　Socks are often used in our life, but you know that the final packaging of socks after production is done manually, which requires workers to pack them by hand in pairs, which takes time and effort. Cui Hai invented a sock packaging machine. As long as the socks are folded and placed on the machine, the process can be completed in two or three seconds, greatly saving time and reducing production cost. (I Love Inventions 20160723 Socks Wear New Clothes)同时也是一头雾水，想着到底是什么地方出现了问题。