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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.It can be clearly seen that after the photo is reduced by reducing the exposure and noise, the photo is pure and undistorted.我要自己独立生活！留下狠话离开出租屋的女主角澪伤痕累累的回归了？！黑化的妖们开始兴风作浪？！妖怪出租屋规模升级后回来啦！！众人皆不出声，独严克恼怒地骂道：老子就讨厌这样事，勾心斗角，颠倒黑白。Ellie is a polytechnic woman. Before the divorce, she worked as a vice president in a small real estate company. She was in charge of projects and often ran to the construction site. At that time, she was a female man who solved the problem cleanly. She was too busy to complain and rushed forward.There are so many words and they are very powerful. Can you say something that you can understand? Say it quickly. How can Ying Long bring cow force?由徐超导演，张子栋、Mike隋、郝邵文、杨爱瑾主演的爆笑网络喜剧《发明大师》讲述了一群“前无古人后有追兵的盖世逗B”在超常人类研究所中发生的爆笑故事。