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Updated May 14He said that hundreds of people come here every day and want to go upstairs and have a look. They have locked up the rooftop.直到马车转过方向，再也瞧不见……尹旭命人将阵亡的楚兵就地掩埋，带了兵马赶回砀邑复命。2. Avoid the infinite expansion of the Context, the logic of state switching is distributed in the state class, and the original excessive conditional branches in the Context are also removed.西汉本始二年(公园前72年)、汉宣帝晚期，到绥和二年(前7年)、汉哀帝登基之间的历史，以五位家人子(汉宫低级宫女)成长史为切入点，着重刻画了王政君和傅瑶，在不同阶段所表现的性格成长过程和权势引发的较量，采用独特的女性视角，以正说历史的写实手法，在严格尊重历史的前提下，大胆挖掘和发挥想象力，刻画了一群在封建专制的皇权(男权)至上的社会形态下，有梦想、有追求的皇后、皇太后的形象，为牺牲在封建体制下的中国女性抒写了一首动人的挽歌。One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.