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However, offline organizations also have many limitations in the process of large-scale development. First, their enrollment and teaching staff construction are limited by regions. Second, it is facing the problem of expansion in different places brought about by the choice of stores and different policies for running schools in different places. Third, the investment required for the construction and management of its stores is relatively heavy. Fourth, there is a shortage of outstanding management talents and it is difficult to duplicate store management talents.故事讲述每天到银行确认有没有老人金进帐的3位老人，决定受够这一切，放手一搏、携手抢银行，但他们面临到一个关键问题，他们不太会用枪……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.神秘的电子邮件，是黑客入侵?是恐吓勒索?还是病毒?可怕的放射物质外泄，是恐怖事件?还是意外事故？大案重案，一案接一案，案情扑朔迷离，危机四伏。公安刑警杨震打入犯罪集团做卧底，突然面临被识破的危险，季洁、郑一民率重案六组刑警紧急前往解救。面对一系列高科技犯罪案，重案六组全力追查，真相一步步浮出水面。2. Mailing"Why?" I went on to ask.