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This chapter is the last lecture on design patterns. It will talk about the third design pattern-behavioral pattern, with a total of 11 types: policy pattern, template method pattern, observer pattern, iterative sub-pattern, responsibility chain pattern, command pattern, memo pattern, state pattern, visitor pattern, intermediary pattern and interpreter pattern. I have been writing about design patterns for a long time. At last it's halfway through, Writing a blog post is a very time-consuming thing, Because I have to be responsible for the readers, Whether it's graphs, codes, or representations, Everyone hopes to write it as clearly as possible so that readers can understand it. I think both I and the readers hope to see high-quality blog posts come out. Starting from myself, I will stick to it and update it continuously. The continuous motivation comes from the continuous support of readers and friends. I will do my best to write every article well! I hope everyone can give opinions and suggestions continuously and jointly create a perfect blog post!Franklin found that the biggest problem with these exercises was that he did not accumulate enough vocabulary, not that she did not know these words, but that he could not make them easy.背景是1940年代伦敦的闪电战。在六年里写了十二部波洛小说之后，阿加莎·克里斯蒂应该是个有钱的女人了。相反，她正努力维持收支平衡。当钱用完后，阿加莎策划了一个计划，要把她最著名的作品杀掉，然后把手稿卖给一个超级富翁。当阿加莎的买家心脏病发作时，这似乎是不幸的，但却是良性的。她的手稿被偷后，一个更广泛的阴谋开始形成。随着炸弹落下，她开始调查，她处境的危险变得显而易见；阿加莎本人就是凶手的下一个目标。3448　　中共地下党组织制定了周密的策反计划，军法处长是国民党安排的特务，挟持舰长必须执行海军桂总司令命令，否则随时炸毁军舰和全舰官兵。那年不也被抄家定罪了么。　　角色选定