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Iterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.For example, Tmall 618 opened the coupon collection and preheating online. When Osaka Weaving House transplanted it to offline stores, it cut the activity into six promotion bands with different themes, specifying the promotion time and purpose, and avoiding the rush of shopping guides. In each band, for different types of users, sales skills are set separately to improve the success rate of shopping guide.　　求问：这出始于谎言的“塑料情侣”大剧，她究竟要不要假戏真做？　　越过大西洋，来到巴黎。电视台记者玛利亚·丽蕾笑靥如花。很少有人知道她漂亮干练的外表下，是 2004年印度洋海啸中大难余生的伤痛。更很少有人知道，险些在那天命丧九泉的她自此之后，生活发生了翻天覆& g, O0 M0 v9 M1 f. H # y! F: k反倒是板栗和葫芦没出声，面色也出奇地平静。The wheel arch material of the new BMW 3 Series is mainly glass fiber, so it has good sound insulation, which is also the commonly used wheel arch material configuration for models at this price. It is worth noting that the front wheel arch of the new BMW 3 Series adopts a split design, and the front half is made of plastic. The reasons for this will be explained below.