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The "Measures" are smaller in scale and lighter in nature than the "Regulations". More targeted, more detailed, specific and fine, more direct operability; Apart from some "independent" official documents, most of them are "implemented" normative official documents, such as various "implementation measures" all have this nature.Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia是的。Learning design patterns does have several realms:《鲜花盛开的村庄》讲述川西平原的柳荫村已经进入了小康，村主任德兴叔的任期到了。在新主任的竞选中，儿媳妇葵花姐几经周折，顺利当选“女村官”。作风泼辣的葵花姐坚信“人有两瓣心，一瓣真心对人，一瓣良心对己。”村官上任后，整治环境卫生、发展豆瓣厂、搞集约化蔬菜种植大棚，赢得了大家信任。但她始终无法解决分地的问题，加之包金旺阳奉阴违，大学生村官好心帮倒忙，葵花姐被逼下台。补选的新村官包金旺不顾村委会的反对，引进制革厂、爆竹厂，但因污染和安全问题被工商局勒令停工。被欠薪的民工们辗转找到包金旺索要工资，危难之际，又是葵花姐站出来，以村民自治的办法，将包金旺的宅基地有偿转让，解决了残局。包金旺主动辞职，葵花姐再次挑起重任。张小敬出身军伍，后受任为主管侦缉逮捕的官差“不良人”，长期协调维护地方安全工作，但却遭陷害被关押于狱中。负责长安城治安的靖安司发现了混入城内的可疑人员，由于张小敬对事发地点人事与地理的熟悉，靖安司特例委派张小敬戴罪立功、侦破此案。经过张小敬的一番调查，发现敌人的阴谋是为了在上元节晚上的集会中制造混乱。距离上元节花灯大会只剩下短短的几个时辰了，张小敬必须在上元节花灯大会前抓住搞破坏的刺客。在调查与追捕中张小敬还发现靖安司中竟然有敌人的内应，在一次次的斗智斗勇中，张小敬终于在最后关头揭穿了背后主谋，阻止了破坏的发生，解救了长安城里的黎民百姓。　　这一次，约翰（哈里森•福特Harrison Ford 饰）成为了巴克的新主人，幸运的是，约翰是一个善良的男人，他不仅非常温柔的对待巴克，还治好了它伤痕累累的身体。随着时间的推移，一人一狗之间产生了坚实的友谊。然而，在一场意外中，约翰被印第安人杀死了，愤怒的巴克失去了理智，它要为自己的主人报仇。