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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:Telecommunications三人跟着脚印，发现很多奇诡的事情，鞋印居然飞上三米高的墙头。一跃三米高，这是什么人？脚印居然跃过七米远的沟壑，闽玥越发觉得诡异。三人费尽心血奔波，跟着脚印走到一个小山谷，三人，一只大雁正挣扎着啄开脚上的大鞋子。三人明白自己被耍了。16岁的运动员蒂姆天赋异禀、表现优异。然而他所承受的压力让他几近崩溃，甚至无法挽回地触犯了人性的底线。　　事业知音难觅，生活中同样。虽然她和小县城的几位男人都有过瓜葛，但是爱她的人她不爱，唯一一次付出的真情，却是落花有意，流水无情。绝望的王彩玲甚至想到了以死了结。Over the years, I have traveled tens of thousands of kilometers on donkeys, horses and motorcycles, and have interviewed many such stories about border protection.99d4f7bec1cd4fb1bc3f413d175a0bf2