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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我们比田齐多了整个河北之地，尹旭是想先切断我们一臂，然后再故技重施，是臣疏忽了，是臣疏忽了。因此他默默地听从这刘邦最初的命令，在巴蜀招募士兵，加以训练，同时积蓄粮草，随时为出巴蜀而坐准备。小爷怎折腾张家了？你说？兄弟还没相认就已经反目，花生气得倒仰，大喊道：有你这么认亲的吗？还来告状，吵得整个京城都知道了，好像要把张家整翻一样，有你这样认亲的吗？张槐和张杨同时大喝：都给我闭嘴。You can prepare several to deal with special situations, but don't be greedy for knives just because you are afraid of wasting drugs... Use them with caution.这一天里，大家都在讨论着司马二，但是司马二并没有回应，好像《沧海龙帝》从发书到现在，司马二就没有发过言。一九四八年春天，山东连连长尚铁龙率部攻打鞍山，在与国明党守敌连长杨寿山僵持中，受到敌方枪袭。他妻子麦草和儿子金龙收到阵亡通知书奔往鞍山，找不到尚铁龙的遗体，只看见掘开的坟和坟前的木牌。尚铁龙被救，死而复生养好了病，坐船回到胶东才知道妻子和儿子到关东接他的遗骨。一家人便因此失去了联系，麦草决意留在鞍山边找工作边寻找尚铁龙消息。却因意外帮助抢救精密机床有功而得到在工厂上班的机会，从而认识了杨寿山。杨寿山对她生活、工作都百般照顾，两人慢慢产生了感情。尚铁龙复原被安排回鞍钢工作那天正赶上麦草和杨寿山的婚礼，三人纠结一生的感情便由此展开。两位男主人公各自的儿女，金虎和小门儿，从小青梅竹马并且彼此承诺了一生的“兄妹”，长大后为了他们的誓言不顾家人反对最后远走北大荒所经历的种种磨难。