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In short, visitor mode is a method to separate the data structure and behavior of objects. Through this separation, the effect of dynamically adding new operations to an interviewee without making other modifications can be achieved. Simple Diagram:Don't pay attention to the title, pure clickbait title, but there are dry goods! Yesterday, I saw a "Daniel" writing an article. On the homepage recommendation, It is called "Learning Artificial Intelligence with String Elder Brother", It was quite a surprise to see the title. After all, there were still bosses willing to write AI articles in the blog park, a technical forum dominated by. Net articles. So I clicked to look at it carefully and found that the style of writing was grandiose. Well, it doesn't matter, just have dry goods. As a result, I didn't find any dry goods in the end. I saw the bibliography, which was very interesting. Put a picture here:该剧改编自2013年同名人气网漫，讲述财阀二世、“唯一集团”副会长、颜值实力兼具的男主李英俊，和在他身边如影随形、既当秘书又当司机、能力满分的9年女秘书金美素的故事Anders Ericsson)大家进入偏殿厅堂，张槐正在上座，见了郑氏问道：还好吧？郑氏点头道：还好。《家和万事成》以中国城最大中餐店家和万事成为背景，讲述奉氏一家人的左冲右撞故事。