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反正就这么回事。Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.'A' * 140 + p32 (write_plt) + p32 (ret) + p32 (1) + p32 (address) + p32 (4)In fact, the name of each mode indicates the function of the mode. The agent mode is to have one more agent class to carry out some operations for the original object. For example, when we rent a house, we go back to find an intermediary. Why? Because you do not have a comprehensive grasp of the housing information in this area, I hope to find a more familiar person to help you do it. This is what the agent here means. Another example is that we sometimes engage in lawsuits, we need to hire lawyers, because lawyers have expertise in law and can operate for us and express our ideas. Let's look at the diagram first:新中国解放前夕，白纸坊警署小警察徐天在追查未婚妻贾小朵被害案件过程中，意外参与到中国共产党和平解放北平的事业当中。面对动荡的时局，金海、铁林和徐天三兄弟所处不同的位置，在亲情、爱情，国家利益、个人信仰发生激烈冲突的时候，情同手足的三兄弟做出了不同的选择，走上了截然不同的人生道路。徐天和共产党员田丹在绝境中相识，使命感让两个人走到了一起，徐天选择在动乱中协助中国共产党取得了北平的和平解放，迎来了新世界。For example, the little you currently control has a local hero and a local soldier around it. In VT No.2 Company, if the soldier flies up, the local hero will suffer less damage. If the local hero is thrown up, the damage will be higher by one piece, and the higher piece will be the V damage calculated for the second time.