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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忽然绿菠和青蒜走进来，嚷道：六哥哥，有好东西分，也不叫我们一声。二十年前一场腥风血雨的武林斗争，让令人景仰的风无缺及江飞鱼成为“武林神话”，二十年后，武林即将再度掀起一场风暴……小鱼和无忌生长在不同的环境，一个是精灵顽皮的赌坊小少，一个是平凡善良的木林樵夫，没想到原本两个毫无关系的人竟在相遇后，抛起多年前的恩怨情仇，历尽多次的共患难，解开种种的疑团，原来两人即是武林神话之后，无缺及飞鱼之子，得知这项令人震惊的消息，两人便更有默契的扛起这场武林的恩怨。二十年前，岳龙轩与双骄之战，改变了武林的历史，二十年后的今日，岳龙轩再次出现，小鱼及无忌一群人即将迎战，这场战役究竟谁胜谁败，多年前的神话会不会再次出现，相信又将是一篇精彩的故事。在历尽种种艰难的挑战及与好友、亲人的天人永隔，小鱼与无忌会是英雄与恶魔的敌人，还是英雄惜英雄般的兄弟情，让聪明的小鱼与善良无忌在精彩又紧凑的绝世双骄一一告诉你。The second hidden page (test2):1. The term "trumpet" means any sound signaling apparatus capable of emitting the required flute sound and conforming to the specifications set out in Appendix III to these Rules.什么时候，江湖上都有这样的武功了？。