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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.Therefore, if there are mistakes, please correct them, if there are problems, please communicate.　　村长李大头带着大家商量着怎么抗击鬼子的报复，地主李忠奉家的大儿子从国民党部队回来探亲，李大头恳请他帮着找国军，吃了闭门羹。李大头们一面做好誓死抵抗的准备，一面派李继成和继善分头去找八路军和国民党军队搬救兵。 为了防止亡村灭种，村子里的年轻人都被赶上了山，其他人用土枪土炮武装起来，纷纷跑到村边的土围子自己的岗位上。　　一九九九年陈水明和周蜜已回到北京，跟周蜜二人小日子过得有滋有味，唯一的遗憾是周蜜一RST means reset, which is used to close the connection abnormally. It is indispensable in TCP design. When sending RST packets to close the connection, you don't have to wait for all the packets in the buffer to be sent out (unlike the FIN packets above), and you directly send RST packets to discard the packets in the buffer. After receiving the RST packet, the receiving end does not need to send an ACK packet to confirm it.七弟养的两条狗也不见了。往那边去，收拢残军。