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《荒野生存》改编自著名作家乔恩·科莱考尔(Jon Krakauer)的散文集，是一个真实事件，说的是一个名叫克里斯多弗的男子(埃米尔·赫斯基饰)1992年大学毕业后，毅然舍弃了所有的财产，投身到阿拉斯加州的茫茫荒野中，体验回归自然的生活。四个月后，人们在一个偏僻的野营地的一辆废弃的公共汽车上，发现了他的尸体。威廉·赫特和玛西娅·盖伊·哈登分别扮演克里斯多弗的父母。站在山坡上往下看，只见好大一片土地。秦旷叫道：父王。SynFlood attack belongs to one of TCP attacks. SynFlood attack is the most common and harmful attack in Flood class, and it is also one of the oldest attacks. Before understanding SynFlood attack, you can look at the detailed explanation of TCP attack.只有付宇锋发出一声大叫，哇塞。The second classification principle of organisms is the lineage classification principle aiming at establishing evolutionary lineage. The classification method following this principle is called lineage classification. The representative of pedigree classification is "branch systematics". It advocates that the branches in evolution should be taken as the criteria for identifying and distinguishing classification units and the basis for determining the pedigree relationship of each classification unit. The so-called co-ancestral proximity (similar to a group of people being a grandfather) is used to measure the genetic relationship between different taxa and determine their position in the pedigree. The classification system finally established is an evolutionary pedigree reflecting the history of phylogeny, which is a deeper description of biological relationship. In other words, the basic principle of pedigree classification is that the classification system conforms to the evolutionary pedigree. Pedigree classification is only applicable to organisms and cannot be used for abiotic classification.