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Originated from ancient times, human beings lifted stones to show their strength. Modern weightlifting emerged in Europe in the 18th century.Abstract Factory: Creates a series of interdependent objects and can change the series at runtime.Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:It's basically enough to get here. Congratulations on your success and you can begin the performance.......女生素颜朝天，清秀脱俗，娇颜微红含羞，如雨后绽放的牡丹，双眸黑白分明，灵亮慧黠，盈盈水瞳不带泥尘气，长发随意披在肩上。还没翻花哩，就被一瓢冷水给浇下去了。于是当年的事情一点一点揭开，更多的真相展现出来。