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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.范依兰的母亲在得到丈夫和儿子的死讯之后，本就重病的身体再也支撑不住，过度悲伤，溘然长逝。There is no requirement for the minimum size of the veneer for the time being, but when either side of the veneer size is less than 80mm, it is required to adopt the form of splicing. For detailed requirements of splicing, please refer to the splicing specification.《紧急追捕》的故事发生在东北某城市。犯罪分子腰绑炸药闯入闹市区，绑架人质，寻找谢元泰勒索钱财，而这时谢元泰却在深圳诈死，化名张子贤潜回该市，策划了一场惊天大劫案，使银行的三百万元巨款遭劫，无辜群众喋血街头。刑警队长江武率刑警与罪犯展开一场紧急追捕的生死较量。在追捕过程中，刑警遗孀李群英的感情被罪犯所蒙骗；案犯何必杀人灭口；年轻的刑警英勇献身；张子贤跳楼潜逃；三百万元巨款不知所踪；一个隐藏更深的黑社会浮出水面；刑警队的副队长行为诡秘……这一切编织出一个又一个引人入胜的情节。整部戏在爱与恨的交织、情与法的冲撞、情场与战场的纠缠中进行。First of all, we still define the methods of Hero constructor and Hero object prototype. In these prototype methods of Hero object, we are no longer responsible for the specific execution logic, but transfer the operation to the intermediary object, which is responsible for doing specific things. We can name the intermediary object playerDirector;.在整个AFL历史上最具挑战性的赛季之一中，跟随六支澳大利亚足球联赛球队的标志性AFL身份迈向2020年总决赛。　　在桑树墩的几次劫难中，贺子丹(王泊文饰)与罗敷共患难并意外的获得了郑王的回信。为了给家嫂治病，心比天高的贺子丹不得已卖身为奴成为公孙宇的家仆。二人为了罗敷几经较量之后，公孙宇的身份被识破，只得被迫离开淹城。而误打误撞献上郑王遗信的贺子丹却被伯淹委派监督双河双城的工程。