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Zhang Liangying《芝加哥医院》是《芝加哥烈焰》（Chicago Fire）的第二部衍生剧，故事描述芝加哥城中最繁忙的一家医院的日常工作——这里有一支勇敢无惧的医护团队，他们团结一致，敢于面对任何风险。每当特定事件（灾难）中的病人需要救治，或者遇到别的医生束手无策的疑难杂症，就轮到他们上场了。与此同时，他们在混乱的急诊室里培养出紧密的关系并一起渡过难关。根据NBC的构想，该剧和《芝加哥烈焰》、《芝加哥警署》将经常交换角色和情节，使三个团队（三部剧集）有机地融和在一起。Yaya DaCosta扮演长相迷人的住院护士Maggie Seaver，是《芝加哥烈焰》核心角色Kelly（Taylor Kinney）的新女友。事实上，他们高中时代就曾是一对恋人，但Kelly在某件事上一直亏欠她。当然，他们都经历了一段艰难岁月，因此一开始他们的关系只是单纯的友情。Severide很高兴能再见到她并与她坐下来好好谈心。讲述了四名少女索菲·内利斯，科琳·福克斯，布莱恩·朱和西斯廷·史泰龙的潜水冒险，她们探索了一个被淹没的玛雅城。当她们进入内部 发现下沉的废墟是致命大白鲨的猎场，心情由兴奋转为惊恐。 随着她们的供氧逐渐减少，必须在水下错综复杂且幽闭恐怖的洞穴和诡异的隧道中寻找逃离水牢的出路。Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:这货郎还跟杨大傻有交情？谁知道……好像是买这批东西，看样子还是值钱货。身边虽只有一千人，却也不可小觑。B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).