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In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.　　在首领叶飞的领导下，众人在交易地点上为夺取两张有关军火资料的电脑磁碟展开生死战。过程中，叶飞与一神秘女子方盈大打出手，一段扑逆迷离的感情在不自觉间发生。叶飞虽然最后能夺取其中一张磁碟，可是却招来其上司杀子之祸，同时自己亦被陷害而踏上逃亡之路，幸得方盈相助才能脱离困境。在位于特兰斯瓦尼亚某座山顶的一桩阴森古堡内，生活着令周围居民毛骨悚然、谈之色变的传奇人物，他就是著名的吸血怪鸭达寇拉伯爵（戴维·杰森 David Jason 配音）。这个几乎拥有不死之身的怪物一度是所有人的噩梦，可是某天不知道什么原因，达寇拉竟然变成一个不爱吸血、崇尚素食且胆小怯懦的小贵族。李炳宪将饰演崔明吉，为了百姓的身家性命力主求和； 而金允石则要饰演金常轩，主张与朝鲜王朝的禁卫军进行斗争。这宅子共三个院子：主院、东院和西院，都是正房带厢房的格局，连上耳房，共有一百多间屋子。Developers use virtualenv to manage multiple development environments