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As the name implies, iterator pattern is to access objects in an aggregation sequentially. Generally speaking, it is very common in collections. If you are familiar with collection classes, it will be very easy to understand this pattern. This sentence contains two meanings: one is the object that needs to be traversed, that is, the aggregated object, and the other is the iterator object, which is used to traverse the aggregated object. Let's look at the diagram:Later, an optimized form evolved, namely content-based e-commerce. Instead of selling goods directly, the stage of content consumption is increased before purchase, and the effect is consumption decision. In other words, by planning the content that users may be interested in, sufficient purchase reasons are provided for users to place orders, thus improving product stickiness, re-purchase or transformation.在衍生剧《私人诊所 Private Practice》剧终四年后，ABC于上年五月时预订另一部《实习医生格蕾 Grey's Anatomy》衍生剧《19号消防局 Station 19》，现定於美国时间3月22日首播。由Shondaland制片﹑《实习医生格蕾》制作人 Stacy McKee执笔的衍生剧背景在西雅图消防局，讲述一群英勇的消防员，上至队长下至菜鸟的他们冒着自己生命安全去拯救民众。Jaina Lee Ortiz饰演衍生剧女主角Andy Herrera，而《实习医生格蕾》的角色Ben Warren医生（Jason George饰）会先继续在母剧出场，然后转往衍生剧里。Grey Damon饰演消防副队Jack Gibson，Okieriete Onaodowan﹑Danielle Savre﹑Barrett Doss及Jay Hayden依次序饰演消防员Dean Miller﹑Maya Bishop﹑Victoria Hughes及Travis Montgomery。Miguel Sandoval饰演消防队长Pruitt Herrera， Alberto Frezza饰演警官Ryan Tanner。　　那次我受伤了：分享你的伤心故事陈启说道：我们网站一直都在努力开发优秀小说的周边版权。This is very understandable. The purpose of the command mode is to decouple the sender and executor of the command and separate the request from the execution. Students familiar with Struts should know that Struts is actually a technology that separates the request from the presentation, which inevitably involves the idea of the command mode!