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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:直到李左车回来，他才稍稍放下心来。The death toll in France is about 300,000.在周四时NBC宣布取消新剧《穿越时间线》，不过突然有了反转，剧集主创Erik Kripke发推指NBC收回取消令，改为续订《穿越时间线》10集的第二季，或有可能在18年夏档播出。花生失声道：这人是个道德败坏的伪君子？张杨摇头道：这事不是他干的，但跟他有关。美国医生马海德来到中国上海，经宋庆龄介绍，于1936年夏到陕北苏区进行医疗考察。在毛泽东等中共领导一对年轻的情侣Kemal(Burak Özçivit 饰)和Nihan(Neslihan Atagül 饰)因为家族的纷争和第三者的阴谋不得不被迫分开，伤心欲绝的Kemal为此远走他乡，一次机遇让Kemal再次回到伊斯坦布尔，从此开始了一段虐心的复仇之战，最终两个人能走到一起吗？