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Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~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.而且项声和逃回去的士兵还提供了一个信息，那就是对方的弓弩射程似乎更远一些。：Duenpatra（pim）在她的祖母住宅的Prapim开了一家自己的服装店，她需要找到一个神秘的死去的母亲。她不相信祖母会死于自杀。总是见到Marut（sean）警察调查她的祖母的案子，最后他爱上了她。她似乎也爱他 。 Hamehirun，来自乌坎库鲁的善良的人。她的祖母的蕾丝就像连接Jumbuvipa的大门一样。由于他在镜子上的出现，他们变得更亲密了，他最终爱上了她。他怎么能和她生活在一起，神奇的蕾丝把它们带到对方身上，最后，它最终会分开？Duenpatra（pim）总是受到一个人的伤害，他们绝对杀了她的祖母。凶手是谁?然后她成为了最后一宗杀人案的嫌疑犯 。 带着暮光的蕾丝花边能让不同世界上的男人和女人幸福地生活在一起吗?Ogat the DevouringAccording to CNCERT sampling monitoring data, in June 2018, SSDP reflection attacks involved 2,684,026 reflection servers in China and 216,281 reflection servers abroad.彭越更为担心是刘邦把自己当枪使，在对越国开战的过程之中消耗自己的实力，那可就得不偿失了。