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　　…章邯沉默片刻，现如今自己也算是走投无路。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.看着那些下河的联军士兵，楚军大笑不止，尤其是看到河中溺死着，冻死者，以及挣钱踩踏致死之人，更是让人爽快。8-12 Sandwich: Write a function that accepts a series of ingredients that customers want to add to the sandwich. This function has only one formal parameter (it collects all the ingredients provided in the function call) and prints a message summarizing the sandwich ordered by the customer. This function is called three times, each time providing a different number of arguments.有的禁不住已经潸然泪下了。Disk startup!