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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.八十年代末期，滨海市建筑学家刘浩明由于意外事故不幸身亡，一岁多的女儿婷婷失踪，其好友鹏达集团经理夏鹏飞与刘妻林蕙兰组建新家庭。婷婷流落偏远山区，被叶大山收养，取名明珠。二十二年后，明珠自学成才。她应聘到鹏达集团工作，与留洋回国的儿时伙伴李超再次相遇，李超多次对明珠表达爱意，均被拒绝。夏鹏飞的司机江志彬为了出人头地，威逼儿子江磊迎娶夏的女儿夏梦洁。建筑监察刘浩宇揭开了鹏达集团挪用资金的内幕，夏鹏飞面临破产。明珠的身世之谜逐渐被揭开，她和李超一起为共同的梦想而努力，成为建筑业的精英。李超的执着最终感动了明珠，两人携手走到了一起，迈向新的未来Once upon a time, female journalists were all dressed in neutral clothes and even asked by leaders not to wear skirts during their work. Because when you enter the reporter's office, you carry machines and make floor coverings. In order to interview, there is no difference between women and men.嗯……杨长帆叹了口气，他当然知道家人在忧虑什么，虽然现今扬眉吐气了，但海寇的劫掠还历历在目。"Well, One more, This soldier, I was impressed, If I remember correctly, it should be Wang Yuanhe. Like Jiang Yong, All spilled by this poisonous liquid, However, he was unlucky enough to splash on his face. But he was quick, He grabbed a medical bandage prepared for dealing with war wounds and wiped it. Most of the liquid was wiped off in the first place, and there was not much left, so although it was blistered, it was not serious. Later, I also specially checked that the bandage he used to wipe the venom was originally white, but after contacting with the venom, it turned black, and when touched, it rotted, just like a rag bitten by worms.Friendly Reminder:与此同时，靖国皇帝——永平帝的圣旨也到了眉山。