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So many concepts, don't have a headache! Let's look at the relationship between the three methods with pseudo code!The character color is white, the character size is ≥ 1.5 mm, and the character line diameter is not less than 0.2 mm.临邛董家张灯结彩，将卓王孙的女儿卓文君迎进了门，为病入膏肓的二公子冲喜。不料，董二公子没能拜堂便咽了气。司马相如回乡路上救起落水的董老太爷，刚送进门来，董孝贤便阴差阳错，将司马相如扮成新郎与文君拜了堂。司马相如事后知道了真相懊悔不已，发誓要将文君救出董家。司马相如仗义执言迫使董家答应由司马相如相将文君送回娘家临邛。而司马相如喝酒误事没能成行。文君迫不得已与丫鬟雨桐女扮男装独自走了。司马相如追到临邛与文君装扮的“杜公子”住在了同一个客店里，加之 卓文君另一冶铁富商程郑的大公子程一飞的介入,与文君主仆二人和司马相如及其仆人桑濮几人之间产生了很多故事。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年轻的文学老师拉奎尔给她的婚姻带来了第二次机会，并搬到丈夫的出生小镇，那里隐藏着她试图解开的黑暗秘密。　　同时，警察在电梯监控录象中发现付强用电话联络过一个人——徐力成。徐力成和徐丁丁见面，在城铁里面，徐力成让徐丁丁背诵数字密码。罗放带徐力成到医院辨认付强和接受调查。作为罗放的大舅子和伤者付强的领导，徐力成对罗放提出自己对安全的担心。罗放认为没有问题。