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? This mode is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while the multiple factory method mode provides multiple factory methods to create the object separately. Diagram:臣还有个想法，就是在全部平定河北诸侯之后，向齐国进军，大军绕道西楚国背后，东西两边夹击。想要成为绚丽的蝶，就必须要经过破茧的痛苦。2013年的一天，瑞安（克里斯·J·穆雷 Chris J. Murray 饰）带着妻子艾米丽（布兰妮·肖 Brittany Shaw 饰）和年仅八岁但乖巧可爱的女儿莱拉（艾薇·乔治 Ivy George 饰）搬入了一栋大房子。适逢圣诞节将至，一节人喜气洋洋，快乐非凡。瑞安不知从哪还翻出一台老式的摄像机，他希望记录下家人每一个喜悦的瞬间，谁知从开机的第一天起便发现种种异常在房子内出现。夜幕降临，女儿逐渐表现出诡异的举止。与此同时，瑞安和哥哥迈克（丹·吉尔 Dan Gill 饰）还翻出了几卷这栋房子20年前的主人们拍摄的录影带，影像中的内容令他们呆若木鸡。只有女儿和摄像机能够看到的“隐形者”，令瑞安一家的生活乱作一团……(1) What is Event Bubble1937年底，负责搜罗亚州国家珍贵文物的特务组织“东方史馆”的副馆长山田潜伏在太原，执行一项绝密任务：夺取宁家价值连城的景泰蓝双龙。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows: