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? Receives two parameters.Liz 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.In reality, we often encounter multi-classification learning tasks. Some two-classification learning methods can be directly extended to multi-classification, but in more cases, we use two-classification learners to solve multi-classification problems based on some basic strategies. Therefore, the fundamental method of multi-classification problem is still the two-classification problem.　　刘学栋摔服独眼龙洪二，被马拧子收为徒弟，马拧子其他几个小徒弟嫉妒刘学栋，经过争斗遂成了生死之交。六年后，刘学栋已长成彪形大汉，他生性耿直，跤法过人，给刘掌柜惹了不少麻烦，但无人继承家产，刘掌柜还得栽培他。本故事讲述了一个在中越边境，以副连长、一排长为首的九人集体，冒着敌人的密集炮火来到三号哨位——一个天然山洞，开始了三个月艰苦的战斗生活。先是闷热，没有水。疾病和潮热时刻威胁着战士们，但他们仍保持乐观的精神。长期缺阳光、缺营养、缺睡眠，使战士们全染上了疲劳综合症。副连长回忆起后方烈士的妻子严萍萍，在丈夫死掉后坚强的活下并抚养起烈士的后代。小顾不幸触电身亡。战士们背着小顾，走在红色的泥浆地上。副连长和严萍萍在一排皮墓碑前寻找烈士的亡灵。Write_plt=elf. Symbols ['write']十八岁时的一场变故让卫卿患上了严重的洁癖症，尽管顶着公司高管的闪耀光环，却无法与异性接触和交往，卫卿深受其扰，苦苦寻找着能够拯救自己的那个“公主”。十年后，因为一场无厘头醉酒，卫卿意外邂逅了十九岁的美术生周是，触碰后本以为“大难临头”却发现毫无抵触。于是，一个以治病为目的协议就此产生，两人互帮互助，互生好感。卫卿在逐渐好转的同时对周是日久生情，周是则在帮助卫卿消除心病的过程中，也放下了遥遥无期的单恋，有了新的人生目标。周是身边的两位好姐妹毕秋静和林菲菲，也纷纷收获了各自的爱情，而周和卫经历各自的成长之后也再度相遇，最终有情人终成眷属。