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Since you use the-R option to modify a rule, You must specify the matching criteria for the original rule, Then we can understand that, The action corresponding to the rule can only be modified through the-R option, So I think if you want to modify a rule, it is better to delete the rule first and then insert a new rule in the same position. Of course, if you only want to modify the action of a rule, don't forget to specify the matching conditions corresponding to the rule when using the-R option.Track and field is the cornerstone of the Olympic Movement and can best embody the motto of "Faster, Higher and Stronger".都已经以社会人的身份生活，成为了正经的大人。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.一位美丽的女演员和一位陷入困境的科学家在他生活和工作的秘密苏联研究所里重新认识了对方。改编叶落无心同名小说此剧主要讲述了关于法学院师生恋的爱情故事。