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次日，依旧是个艳阳高照，春光明媚的好矢气。Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.Say a word and do a thing.就这样，怒火中烧的项羽率领诸侯联军进入关中。有了若不能，就……就一定要想法子弄一辆来。Among them, most unreliable success studies have chosen the wrong practice method. Although the slogan they shout is deliberate practice, the essence is not deliberate practice, because they do not activate long-term memory ability. For example, the number of times you play chess has no effect, and you cannot become a national player for 10 to 10,000 hours. However, if you look at the published chess scores and then speculate on the national players' playing methods, this deliberate practice method is to save SSD hard disks into the long-term memory hard disks: chunks that store the chess scores.