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Specific symbols for macro definitions are represented as follows:让郑姑娘给老奴帮忙吧。戚耀辉与江健华同是消防学员的优异生，俩人皆好胜。女督察区芷晴的出现，令俩人与其女伴胡丽娟、张宁的关系添矛盾。此外，辉惊悉其父救火殉职乃因一时贪念，顿时意志消沉。华暗助辉，查得当年火灾原是晴父所为211. X.X.45The 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.As a result, many families on the verge of disintegration will carry out difficult maintenance "for the sake of their children".Abnormal problem: The promotion information of commodities shall be subject to the information in the "Promotion" column of the commodity details page; The specific selling price of the goods shall be subject to the price on the order settlement page; If you find any abnormality in the selling price or promotion information of the active goods, it is recommended to contact the seller for consultation before purchasing.