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Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means.官方宣布第4季ABC已续订《神盾局特工》第四季。Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.Temple of Heaven《最响kamizmode!》是以相扑、太古、音乐的融合为概念的新作战斗动画，讲述了喜欢音乐的小学生和石之神相遇后发生的故事。The length of training depends on the profession you intend to enter. Usually, the key step you plan to start your IT career is to choose a school-depending on the length of school study-which is generally not very long. You don't need to go to college for 4 years or night school for 2 years. In fact, you will get certification within 6 months, which will make you face many job opportunities. Of course, it is full-time study. Rome was not built in one day. Although six months is not very long, it is enough for a person who plans to switch to IT.