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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《心冤》将以近5年几宗极之轰动、人们会记得的案件为重心，虽然是奇案的角度，但会用新的手法去拍，着重犯罪者及执法人员的心理。本来，他还是可以凭借自己的人品和张家淳朴的门风赢得胜算的，可是，这一切都葬送在两年前——周爷爷知道他曾心恋他人。他根本就不是张家儿子，认什么亲。这一期的杂志要是不卖到脱销，他的姓就倒着写。故事紧接前三部。萌犬的家族越发壮大了，泰妮结婚了，生下了可爱的萌犬宝宝辛迪、罗希、查理和布罗迪。隆冬将至，泰妮迫不及待要跟自己的宝宝们共度他们降生后的第一个圣诞节。然而，比起和家人共度美好时光，小家伙们似乎更热衷于拼命搜刮礼物。为了让孩子们体会到圣诞节的真正含义，泰妮和老公筹划了一场萌犬好声音圣诞节特别节目，向家人演唱圣诞颂歌，并请来了神奇的圣诞老人和他的驯鹿！