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The loss (attrition) of the army in the war generally consists of death, injury, capture, disappearance and other parts, while the death of soldiers includes death from battle, death from injury, death from other causes and other components.The essence of these 23 design patterns is the practical application of object-oriented design principles, and it is a full understanding of the encapsulation, inheritance and polymorphism of classes, as well as the association and combination of classes.Find the learning community: Because a large amount of knowledge exists in the practice of the learning community, not in books, effective learning is not to close the door and practice hard, but to find your own learning group. For example, programmers practice programming on websites like GitHub.In addition, it is worth noting that in recent years, many K12 discipline education institutions have gradually extended their applications to the field of quality education based on the original discipline system.