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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.The hybrid method combines the above two or more defense methods. For example, some terminal operating systems implement a large backlog queue and SYN? Cookies, but only when the backlog size exceeds a certain threshold? Cookies are only used so that SYN is not involved? Cookies flaws in the case of normal use, also allows the transition to SYN-cookies defense in the event of an attack.素谨看着她们，忽然道：姨母跟表哥慢慢说话吧，我去歇息了。于是皇帝下旨，将宁静郡主赐婚与朱雀将军。女博士布莱南是个刑侦检验专家，善于从受害者的遗骸中发现破桉线索。联邦调查局在发现肉体完全腐烂只剩下不可辨认的骸骨的受害人时，经常求助于博士和她的小组.With DFU, the system will be purer.The humanoid monster in the former is relatively slow, But the ability to fight is very strong, Not sensitive to puncture attacks, Can resist medium caliber and medium power rifle bullets, In the face of fire, Only when they are completely smashed or their heads are cut off can they be killed. The latter, an unknown creature similar to a "dog", The target is small, Fast speed and evasive ability, After listening to Liu Guangyuan's description, After it can easily cross a large crater with a diameter of 5-6 meters, the impact speed is not weakened, so it can be seen that the unknown creature has extremely strong explosive force, rapid movement, and strong adaptability to complex terrain, but its defense force is poor, and it will die after being hit more times by weaker casualties (such as high-speed steel balls in anti-infantry mines).