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Conclusion: The page with SingleInstance is initially created with a task stack to this page, and then the pages in this stack are reused all the time. Note that only this mode will create a new stack for the initialized page. The rule of return is to finish the stack where this page is located first, and then finish each page of the next stack.Dynamically add some additional responsibilities to an object. In terms of adding functionality, the Decorator pattern is more flexible than generating subclasses.荒凉高校一年级学生白浜兼一是个软弱的男孩子，在中学时代经常受人欺负，于是他为了改变自己并充实自己的高中生活决定加入空手道部。但是空手道部里的壮男大门寺讨厌兼一，并强令兼一与其比试，而且条件是“输得人要被踢出空手道部”。就在兼一为自己感到绝望的时候，刚刚转校而来的美少女风林寺美羽出现，并带着兼一来到了梁山泊训练。In terms of curriculum system construction, most companies take "mathematical thinking" as their entry point. Among them, Growth Insurance benefited from its early establishment. In addition to mathematical logic thinking courses, it also launched a series of courses on language logic thinking, concentration and memory. At present, all courses have been launched. However, the curriculum contents of institutions such as spark thinking, one-off mathematical thinking and talent communication have only completed phased research and development and have been put on line, and some contents still need to be developed.1927年对共产党来说是血雨腥风的一年。在不到半年的时间内，中共中央两次被迫迁移。第一次是从上海迁往武汉，第二次则是从武汉迁回上海。两次迁移，都是因为猝不及防地遭到过去的盟友国民党的突然袭击。 　　中共武装反蒋后把中央领导机关秘密建立在上海。首先是因为中共没有稳定的根据地，只能选择在群众基础较好的大上海；其次是因为上海有租界，租界区华洋杂居、政出多门，各种势力矛盾重重，且租界区不查户口、交通便利。在租界区，国民党的警察、宪兵和特务不能随便执行“公务”，更不能开枪、捕人。租界巡捕房捉到共产党，国民党当局只能通过法律程序进行“引渡”。“国中之国”的这种特性正好可以加以利用，寻找掩护的职业和场所，设立党的机关，进行秘密活动。 　　在这种错综复杂、暗流涌动的大历史背景下，如何有效地保卫处于秘密状态下的首脑机关，成为中共中央一切工作重中之重。于是，由周恩来首倡，在原中央军委特务工作处的基础上，筹建了“中央特科”这个政治保卫机构。 　　电视连续剧《江南锄奸》正是以此为背景，表现了那个年代中共特科在党Translator's preface4. SingleInstance