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MDT team sets up its own speech system;事关皇室辛秘，王族权贵，他却未有一点惊讶，十分镇定。In the specific life cycle, the method to find the user's characteristics, in addition to building a data model, is to analyze the user's characteristics, which can be divided into two types: refinement and scenario, as shown in the above figure.Terms and definitions一座刚刚经受过一场台风袭击后的现代化沿海城市，市长吴刚在早上八点钟接到了一个犯罪团伙头目陆天豪打来的恐吓电话，他声称他们掌握了五十多年前，国民党在逃离大陆之前所遗留下来的地下巨大秘密弹药库。如果在二十四小时之内，不把同伙大毒枭“黑雕”放出来，他们将全引爆该弹药库，毁掉城市。吴刚没有丝毫懈怠，果断的紧急召集有关专家和人员进行调查和磋商对策……与此同时，吴刚的妻子赵玫因涉嫌受贿被机场警方截获。省委联合调查小组和专案组组长，主管政法的市委副书记钟平见状，陷入沉思中……吴刚为了打击犯罪团伙，避免大爆炸，表面上佯装答应罪犯的条件，暗地里组织人员想尽办法阻止大爆炸的发生。但是，祸不单行，一艘外籍货轮“巨鲨号”满装着危险物品因为违章行驶，船上的船员由于不小心引发了一场火灾，烧坏了货舱里的温控系统，使之货舱里的温度急剧升高，随时都有发生大爆炸的危险。这时，吴刚的妻子赵玫在接受隔离审查的时候，突然跳楼自杀了。此时钟平的儿子钟磊无意中听了大爆炸的消息，并将其通过网络发送出去，顿时，整个城市，人心慌慌。万般无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