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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.There are 31 events in the Olympic swimming competition, which is the second largest gold medalist after track and field.迁都背后的政治和军事意义必然非常重大。但是现在并不是和云青山闹矛盾的时候，再者，没有到最后一刻，共尉也不可向死心。　　他处处与小鹿作对，让小鹿恨的牙痒。培训结束后小鹿应聘进了旅行社，而对手的一家旅行社也把丁健挖去，小鹿没想到同她作对的老师又成了竞争对手，小鹿带团出游，不时闹出很多笑话，惹了不少麻烦，还总在最关键的时候心狂跳、莫名其妙晕倒……她对自己渐渐失去了信心，觉得度日如年，而她也在这样的日子中慢慢改变……邪恶的巫博士（白文显 配音）为了让自己发明的高科技VR玩具垄断所有孩子的童年，制定了毁灭所有传统毛绒和机甲玩具的阴谋。呆萌腼腆的泰迪熊（邓小婷 配音）本不想参与此事，但在机甲战士小飞（白文显 配音）的强拉硬扯下误入了冒险之旅，最后拯救了玩具世界。