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Structural patterns, as the name implies, discuss the structure of classes and objects and are mainly used to deal with the combination of classes or objects. It includes two types, one is class structure pattern, which refers to the combination of interfaces or implementations by inheritance mechanism. The second is the object structure mode, which refers to the realization of new functions by combining objects. It includes adapter mode, bridge mode, decorator mode, combination mode, appearance mode, element mode and agent mode.Learning thinking and learning methods are very important, resulting in three situations of confusion and poor harvest: short contact thought comprehensive, incomplete mastery eager to overthrow, insufficient comprehension and rhetoric, and the most important thing in learning is to keep a large period of time and practice deliberately patiently and modestly.1940年3月，汪伪政府宣布成立。侵华日军在上海大肆搜捕抗日志士，汪伪组建由前国民党军官毕忠良担任处长的“特别行动处”为虎作伥。一直潜伏在毕忠良身边、代号“麻雀”的中共党员陈深，与组织暂时失去联系。置身虎视狼顾的险境中，陈深信仰坚定，冒死营救上线“宰相”及抗日志士。毕忠良老奸巨猾，虽与救命恩人陈深“情同兄弟”，却对其产生怀疑，设重重陷阱步步紧逼。“宰相”牺牲后，陈深终于找到新上线“医生”并受命拿到日军代号为“归零”的重要作战计划。陈深的昔日恋人徐碧城，与另一国军情报人员唐山海假扮夫妻潜伏进特别行动处，在多次行动中给陈深制造麻烦和危机。智计过人的陈深身处连环杀机之中，巧妙利用日本鬼子、汪伪分子等各派势力之间的微妙缝隙，同时也付出了巨大的代价，最终成功地获取了“归零”计划，挫败了日本侵略者的阴谋。Three, professional and technical requirements of high training projects除安妮斯顿和威瑟斯彭外，第二季的回归演员阵容还包括史蒂夫·卡雷尔、比利·克鲁杜普、马克·杜普拉斯、内斯特·卡博内尔、卡伦·皮特曼、贝尔·鲍利、德西恩·特里、贾尼娜·加万卡、汤姆·欧文和玛西亚·盖伊·哈登。新加入本季的明星有格雷塔·李、鲁埃里·奥康纳、哈桑·明哈吉、西比尔·理查兹、塔拉·卡辛、瓦莱里亚·戈利诺和朱丽安娜·马古利斯。