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Mitigation strategy本片从两个不同角度讲述了一对夫妻的故事，他们从56K调制解调器的时代开始约会，并在接下来的二十年中维护着这段感情。那些才是我爹带回来的。日久天长，自然就成习惯了，脚底下轻飘飘的Two, civil aviation pilot level:　　但旗下歌手宋玄（宋亚轩饰）和音乐制作人陶醉（李天泽饰）却交情深厚，经常相约工作室交流音乐。Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.