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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.在命运的交叉点，当麻和焚流能否阻止世界的灭亡？四个十几岁的朋友，在法国和瑞士边境，他们的生活被世界上最大的粒子对撞机LHC的实验搞得天翻地覆。古老的院落，滴答的流水声，悬梁上的女人。乡下的深山中，有一座宋氏老宅，是宋茜祖上的产业。可是宋茜从小到大都被严禁靠近那所宅子。当宋茜问起原因时，所有人都支支吾吾，不愿说出实情，宋茜偷偷潜入老宅，揭开了一个年轻女人在封建社会残酷的身世…李左车说道：我军虽然暂时落败，但是并未一败涂地。Only 2G, not 3G. You need to cut the card to go to the business hall.Note: The singleton methods used in Android source code include: InputMethodManager, AccessibilityManager, etc. all use this singleton mode.