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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.Today, distributed attacks are really feasible because criminals have thousands of hosts for him to carry out denial of service (DoS) attacks. Since these large numbers of hosts can continuously increase or decrease and can change their IP addresses and their connections, it is still a challenge to prevent such attacks.板栗点头笑道：这倒是。EventArgs e=new EventArgs ();14恶魔游戏软件Ryo Takayama Tamori　　行动日子逐渐逼近，面对生化武器与人命，情与义，多特面临有生以来最严竣的考验……该片聚焦明治时代的著名实业家五代友厚,讲述他从幕府末期到明治初期,从萨摩藩士转而成为明治政府官员,后又成为实业家,为大阪奠定商都之基础的故事。