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感谢书友【冷酷宣言】【裸枫】【弑杀淡然】的慷慨打赏。I hope I can help you ~两年后，卧底在内地毒贩组织中的缉毒警察张晨，得知T国新毒王进入内地。为追查线索，张晨接近唯一知情的郭阳，却不料郭阳却遭人陷害身陷囹圄，张晨只得周旋在贩毒组织和警方中营救郭阳。受到多重压力的郭阳认定新毒王是陷害自己的背后主使者，他联手张晨深入毒贩组织，接近内地毒王沈钰，却被新毒王设计成为通缉犯。同时新型毒品的制毒师被新毒王控制，身份逐渐浮出水面，事情更为错综复杂。该作以美国南北战争为背景，以19世纪美国新英格兰地区的一个普通家庭四个姐妹之间的生活琐事为蓝本，讲述他们在母亲的帮助下成长为独立女性的故事。周夫子忽然出声问道：耀辉是你爹？周菡啊了一声，转头见老人家目光犀利地看着自己，立即扑通一声朝他跪下，苦着脸道：爷爷，孙女不是故意不说的，孙女是想……你想在我寿辰之日，让你爹亲自前来，给我送上一份大礼，是不是？周菡嗫嚅道：是。如今忙着收庄稼，收完了有的卖，有的进仓，一刻不得闲。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