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As one of Germany's troika, BMW has always been a representative of the pursuit of extreme control. The common saying "drive a BMW and ride a Mercedes" is still a creed respected by many people. For a long time, the 3 Series, as one of the models that best embody the essence of BMW, has been favored by consumers. BMW also dotes on the 3 Series, after all, it does not want this golden signboard to be destroyed in its own hands.鍵 江口洋介 郷田ほづみ我们先去吃饭吧，这里不是说话的地方。Test Scenario 2: Loop to the target page (SecondActivity sets singleTask)Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:[News Survey] 20190105 Divorce