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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剑雨腥风江湖路浪迹天涯为血仇，英雄儿女多恩怨，经颜自古是薄命，一朝快意恩仇定乾坤。手持“断肠剑”的“飞天猪”是个神出鬼没、作风诡异的职业杀手。而且，处处与“盲侠”作对。原来“飞天猪”就是卖艺团的“书呆子”仲贤，他的杀父仇人也是白无常。为了报父仇，不让任何人在他之前杀了白无常，所以，次次干扰“盲侠”杀白无常。然而，为了报仇，本性善良的他对杀戮变得麻木不仁，心中唯一的目标就是杀掉白无常！当“盲侠”几经周折找到白无常时，“飞天猪”再次出现……当他看到金鱼被“一刀了”把刀架在脖子上时，仲贤恢复了善良的本性，和“盲侠”一起同白无常、“一刀了”展开了一场为“复仇”起的大决战……Earthworm: Although the IQ is lower, people have verified that reading books bought by their father and absorbing a large amount of relevant knowledge within three days in the cafe.不一般的关系，不一般的情感，引发出不一般的故事…… 女警张敏芝被派往深圳任职，住在罗芳区内。邻居一名老妇人称大嬷，年纪老迈，无依无靠，赵丽薇为疯妇一名，亲儿夭折，被男友弃，患上产后抑郁症，常以枕头或公仔当儿子，爱骂男人为负心汉…… 某日，大嬷的孙儿李浩强归来，但无故常被人追杀，敏芝调查得知美国黑帮杀手黑熊是寻找浩强，怎料黑熊误杀大嬷，丽薇发狂与黑熊纠缠，敏芝赶到现场救得两人，浩强说出因由，原来浩强早前潜往美国当黑市居民，于掌馆当杂务及拳靶，受到唐人街黑帮大少欺压，不慎误杀之，黑帮大佬派黑熊向浩强下江湖格杀令，浩强被迫往返家乡。但黑熊已率领众向浩强展开追杀，众人面临危机……项少龙为大秦崛起操碎了心，用一句鞠躬尽瘁，死而后已来形容，绝不为过。娱乐公司总监的海灿海归回国，因巧合认识了老师雨彤，发现她手上的疤痕，发现她可能是自己一直要找的儿时玩伴，于是接近雨彤。而雨彤其实具有另两重人格，一种擅长拳脚功夫的阿健，另一种是美艳动人雷凯莉，因跳舞视频和海灿的好友毛峰导演走在了一起。偶然间，海灿发现雨彤就是自己要找的人，并得知她的多重人格。通过进一步接触，得知雨彤是在领养家庭里被养母虐待致病。从此海灿日日守护，两人恋爱，而在海灿前女友的多重打击下，雨彤决定离开海灿。