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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:高中毕业的吉川菜绪与她最最最最~爱的上原踏进了大学的校园，甜到牙疼的这对情侣虽然没有继续同居但成为了邻居。然而成为大学生的上原立刻就被全校女生追捧，菜绪看在眼里别扭在心里。张嘴吃糖的时间到了旁友们再者，江东二郡虽然好，垂涎三尺也在情理之中，打下来是一回事，能不能守住是另外一回事。Tibet Autonomous Region郑氏卧房外间，小葱、红椒、山芋、南瓜等人围着玉米，七嘴八舌地问这问那，张大栓两口子满脸喜悦地在旁看着，郑氏坐在软椅上，脸上含笑，眼神却淡漠。The person in charge of the MDT is responsible for ensuring that the patient's claim has been (or will be) addressed.