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徐文长惊讶过后，很快想到了后面的事。Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.20 yuan Face Value Birthday Banknote他自问自答地解释了缘故，觉得张家被抄光光了，就大度地一挥手道：老夫也是奉命行事。韩信道：以濮水河面为屏障是好，大军无法渡河偷袭是不可能的，少数几个游泳过河却是可以的。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.　　《暗礁》由Poppy Montgomer y及Ken Sanzel共同开发，剧中讲述前飞贼的女主Cat Chambers当起了问题解决者（《寻人密探组 Without a Trace》及《记忆神探 Unforgettable》的Poppy Montgomery饰），她为一处犹如天堂般的太平洋小岛的总督处理各种问题；Cat的犯罪过去令她最为了解罪犯的想法，因此她对这工作可谓是得心应手。