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Abstract Factory: Creates a series of interdependent objects and can change the series at runtime.我代你师祖保管七年，七年之后，你找个像样的徒弟，拿回这倚天剑。This article will try to describe the relevant concepts of iptables in an easy-to-understand way. Please read it patiently.The second season of "Charming China City" has been upgraded completely, "Charming China City? The establishment of the" City Alliance "and the official launch of the" Charming Card "program mean that there is a broad prospect for the deep integration of culture and tourism, and the sustainable development of the city will also usher in a new breakthrough. CCTV's combination of boxing to help the poor through tourism shows the sense of responsibility and mission of the national big station.The decision-making power of the policy mode rests with the user. The system itself provides the implementation of different algorithms, adds or deletes algorithms, and encapsulates various algorithms. Therefore, the policy mode is mostly used in the algorithm decision system, and external users only need to decide which algorithm to use.