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许悦是一位受过良好传统教育的80后，事隔十年他与小时候一起长大，后移民美国的邻家妹妹米恩再次相遇，米恩租下了许悦隔壁的房子，两个人再度开始了邻居生活。米恩从小就喜欢许悦，且为了许悦而回国，许悦却只将米恩当妹妹看待，米恩选择默默地陪在许悦身边。许悦在经历感情欺骗、事业失利、亲戚朋友疏远之后，一度对自己从小受父亲教育影响的做人处世方式产生了怀疑，对当今社会上的诸多不良现象由不满变为妥协，开始变得自私自利。米恩了解许悦所经历的一切，不懈开导和帮助许悦，让许悦重新找回做人的方向。在两人相处过程中，许悦逐渐意识到自己对米恩的情感已经开始发生变化，他们在忙碌的工作之余、在生活的点滴小事中不断积累情感，最终修成正果。四月初一我去改命，改不掉一死而已。If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.State mode is one of the implementations of state machines, but in a "classless" language like javascript, there is no stipulation that state objects must be created from classes. On the other hand, Java Script can use delegate technology very conveniently without having one object hold another in advance. The following state machine chooses to delegate the request directly to a literal object through the Function.prototype.call methodLiz Bonnin presents a controversial and provocative episode of Horizon, investigating how new scientific research is raising hard questions about zoos - the film explores how and why zoos keep animals, and whether they need to change to keep up with modern science or ultimately be consigned to history.Should zoos cull their animals to manage populations? Liz travels to Copenhagen Zoo, who killed a giraffe and fed it to the lions, to witness their culling process first hand. They think it is a natural part of zoo keeping that is often swept under the carpet. Should some animals never be kept in captivity? In a world exclusive, Liz visits SeaWorld in Florida and asks if captivity drove one of their orcas to kill his trainer.But could zoos be the answer to conserving endangered species? Liz examines their record, from helping breed pandas for the wild to efforts to save the rhinos. She meets one of the last surviving northern white rhinos and discovers the future of this species now lies in a multimillion-dollar programme to engineer them from stem cells. Veteran conservation scientist Dr Sarah Bexell tells Liz the science of captive breeding is giving humanity false hope.