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The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.《天上女子》讲述为了给姐姐复仇而从一个见习修女变成冷酷恶女的女人李善宥（尹素怡饰）、爱上尹素怡的富三代徐志石（权律饰），以及一手让李善宥变成恶女的男人张泰正的故事。巨石强森在社媒体上公布NBC喜剧《Young Rock》的主要演员阵容，这部喜剧取材于他的生活，该剧将于2021年首播，由多名演员扮演他本人的不同阶段人生的角色！欢颜房地产集团公司董事长兼总裁翦润堂突然辞世，为女儿翦丹丹留下一份奇特遗嘱：如果翦丹丹能说服董事会让她担任总裁，并能任职半年以上，则可获得十二亿六千万个人遗产；否则，遗产将另做安排。染着黄头发、只对打电脑游戏着迷的翦丹丹被迫坐上了总裁交椅。英俊潇洒的龙浩、文弱坚毅的江南雨以及优雅动人的甄一心为不同的目的，以不同的方式对翦丹丹鼎力相助。四人需携手迎战重重危机，又要各自面对青春困惑。错综复杂的公司纠纷，惊心动魄的营销大战，诡谲莫测的遗产风波，加之缠绵悱恻的爱情纠葛，一幕幕让年轻的心灵无法承受的恩怨情仇，在商战风云中愈演愈烈。为了迎接成长，追寻真爱，四个年轻人都付出了太多的代价……在距离现代不久的未来，由於科技的进步，人类赖以代步的汽车早已完全被电动车所取代，每部车辆皆强制配备AI（人工智慧）自动驾驶的功能，配合著都市电脑交通管制系统，车祸事故与交通混乱的现象似乎都不再发生了……。If all are set to open-drain mode: otherwise for C language programsAs mentioned above, we can see the benefits of writing form verification code using policy mode. We have completed the validation of a form by adding configuration. In this way, the code can be used as a component and can be called at any time. When modifying the form verification rules, it is also very convenient and can be called by passing parameters.