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Iterative sub-patterns: Iterative sub-patterns can sequentially access elements in an aggregation without exposing the internal appearance of the aggregation. The aggregation of multiple objects is called aggregation. Aggregation objects are container objects that can contain a group of objects. Iterative subpatterns encapsulate iterative logic into a separate subobject, thus separating it from the aggregation itself. Iterative subpatterns simplify the aggregated interface. Each aggregated object can have one or more iterative subobjects, and the iterative states of each iterative subobject can be independent of each other. Iterative algorithms can be independent of aggregation role changes.与此同时，段天赐视天婴为未婚妻，以保护为名囚禁她，却被她冲破恩情绑架，与之划清界限；洪家千金洪澜暗恋罗浮生，处处刁难她，却被她以真性情打动，情敌变闺蜜。Chapter 31　　被困在绝地的村民们惶恐不安，每个小时都有人死去，命运似乎注定朝向了死亡，他们的生命和人性都承受着巨大的考验……"The practical activities are over. I'd like to share my harvest with you and thank the general managers for their help. You should lead everyone with your speech. We should make college students a position to cultivate talents with good moral character and high intelligence quotient!" On the day the activity ended, Teacher Sun sent a message to the captain. Mr. Sun Yimin always faces every student activity with the greatest enthusiasm. He can always think of problems that the team members have not considered. Not only that, the teacher also participated in the interaction with us and asked questions about college students' entrepreneurship and employment when facing the leaders of the enterprise to make this practice more exciting and full.李敬文不放心她。戚继光深知胡宗宪秉性，面对此境也唯有一叹。