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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.PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.鲁三在旁看了暗笑。哈哈哈。这是一部经典的诙谐浪漫喜剧，也可以看作是农村版的花样少男少女。女主Taddao是父亲的私生女，父亲过世后，她的家族身份不能得到正式承认。为了找到父亲的遗嘱证明自己是Bussaya家族的人，她女扮男装变成Tad回到大宅，寻找可以证明自己身份的证据，而男主Por则是她的守护天使，在她遇到困难和危难时，总是第一个帮助她，拯救她，爱意渐渐萌芽，究竟最后Todda能找到遗嘱证明自己的身份吗？她和守护天使的爱情会圆满结局吗？跟看国宝似的盯着他，偶尔有人说一两句干巴巴的安慰或鼓励的话，一点效果也没用，还换来兄弟姊妹们的白眼。