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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:2. The synchronized keyword locks the object. When using it, it must be used in the appropriate place (note that the object and process that need to be locked may not need to be locked in the whole object and process sometimes)该剧以清末民初封建王朝的没落与社会转型为背景，讲述民间魔术艺人用朴素而本能的爱国情怀，传承、保护国粹的故事。有着数千年历史的中国戏法，到清末形成了三大派系：北方的“沈家堂彩”、“莫氏手彩”和南方的“鬼道戏法”。然而随着列强文化渗透的加剧，日本魔术师对我流传千年的戏法秘籍《神仙戏术》虎视眈眈。他们以传艺为名潜入天津，制造血案挑起我戏法派系争斗，收买地方官吏控制我民间艺人，企图将我国宝据为己有。同时，袁世凯之子袁克定通过打压、引诱、陷害等手段，迫使艺人为其政治阴谋服务。这种双重压迫，使得民间艺人的生存空间异常狭小艰难。以“沈家堂彩”掌门人沈万奎为首的一批民间艺人，不畏艰险，誓死保护国粹，传承中华文明，由此演绎出一段惊心动魄的悲壮历史。全剧由“复仇”与“保护国粹”两条主线贯穿，而主人公来宝的人生轨迹则由前半部的以报杀父之仇、让“莫氏手彩”重振江湖为主，转变为后半部的以对抗日本魔术师武藤章、助推反袁斗争为主。The soldier first twitched after being stung, Then the gun fell out of his hand, and at last the whole population foamed at the white eyes of both eyes turned out. He lay on the ground and shivered twice before moving completely. Later, when examining the body, he found that his pupils had completely dispersed and his face had turned gray and black. At first glance, he died of acute poison. " Zhang Xiaobo said, through this narration, I can see that he is obviously a person with strong expression ability. He not only speaks vividly, but also has rich body language. Gestures and gestures are basically just right to match the language.一代天骄成吉思汗是闻名中外的蒙古族的英雄，是公元后第二个千年最伟大的人物之一。该剧全面介绍了成吉思汗的一生：十二世纪中叶，中国北方在金朝统治之下。大漠南北草原各部还各自独立，互不统属。金朝对其实行“分而治之”和屠杀掠夺的“减丁”政策，蒙古部首领俺巴孩就曾被金熙宗残酷地钉死在木驴上。正是这种几代冤仇导致了草原内外的长期征战，孕育了以征战为主要生活内容的一代天骄！The main purpose of the meta-sharing mode is to realize the sharing of objects, i.e. The shared pool, which can reduce the memory overhead when there are many objects in the system and is usually used together with the factory mode.大家都是一个目的，为了国术。