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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.--Note: example is the database for testing, and the corresponding Example_log. Ldf is the log file for testing故事的舞台是一个叫“Chuggington”的小镇，那里住着各种各样的火车。英语的“Chuggchugg”相当于日语的“Shushupopo”，将“chugg”和“town（小镇）”组合成“Chuggington”，也就是小镇名字的由来。在这里住着许多火车，他们和人类一起生活一起从事各种各样的工作。主人公是住在这个小镇上的小见习火车3人组，他们是“威尔逊(Wilson)”、“可可(Koko)”和“布鲁斯特(Brewster)”。故事描述了生活在Chuggington镇的3人，在火车前辈的指导下经历各种各样的事情，一起欢笑难过，一起成长的过程，既让人轻松愉悦，也不乏温馨感动。20　　所幸陈扬伤势不重,绵绵和苏盈见面,两人顿生一种奇怪的感应。119. X.X.73