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At that time, it was quite confusing to see this bibliography. Mathematics was recommended from high school mathematics to mathematics analysis for mathematics majors. As soon as the computer algorithm class came up, it recommended the big "Introduction to Algorithms" and the theoretical "Data Mining: Concepts and Technologies". It was not suitable for such beginners. Reading should be ladder-shaped, and one cannot eat into a big fat man in one bite. Because I don't want "Daniel" to mislead people, I give the following suggestions:3. Voluntary Service: At the moment, many young and middle-aged people in rural areas are working in the coastal areas of Guangdong. Most of the people who stay at home are old, weak, women and children. Naturally, they will encounter many difficulties in life and study. We will call on our volunteers to do what they can for these lonely, elderly and left-behind children and bring them some real help and convenience.Public interface Visitor {后发制人，一击必中才是高招。EXAMPLE 1The legendary swordsman: Sword's "Skill Damage" +100%.　　在此之后，兆邱反而对予丽更加感兴趣，他尝试走入予丽的家中，却发现这个女孩身边却充满了可以看到的鬼魂。更可怕的是，鬼魂也跟在了兆邱的身边。以此为契机，两个完全有着不同人生的人彼此渐渐了解，兆邱也开始了解予丽悲惨的过去……