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郦食其心中陡然生出一个念头来。项羽会留意他的行踪，途中进行截杀，这是早在意料之中的事情，所以尹旭一点都不惊讶。The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.将来他们有什么话，也不能怪咱们，反正咱们都说在头里了。　　空中，穿破云雨雷电；陆上，踏着颤抖的大地，向着灾区开进。消防救援队、医疗医护组、新闻报道组、民间志愿者纷纷涌向灾区前线。一场众志成城、轰轰烈烈的生死大救援就此展开……Moreover, as can be seen from the counter of the second rule in the above figure, no message has been matched by the second rule at all.A basic idea to solve the problem according to the point already reached is: after the user clicks the return key, he kills WeChat's activity and returns to our App page;