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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.那就好，杨贼守不住这里的，还有人能回来。It happens that I like you too她冲着前面车边一群正忙碌搬东西的灰不溜秋、黑黢黢的小子们——也不知都是些什么人——扬声喊道：南瓜，别搬了。你们还小，谁知几年后又是个啥样情形？不定亲就不定亲。所有的监控摄像头都已经被升级和联网到一体，通过监视人类的色相浑浊程度和声音、视频等信息用来计算人类的每个心理状态和个性倾向所衡量的值，通称：（即片名：心理测量者PSYCHO-PASS），它被用作判定人们的思想应有PSYCHO-PASS状态、个人精神本身。通过计算这些数值，系统可以自主断定一个人最理想的工作，感情，心理压力，甚至犯罪意图。可是想要战胜越国还是非常困难的。