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Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.　　止戰之印蓋落，武林陷入前所未有的局面。背後主導乃聖魔元史，正開啟著一樁接著一樁的陰謀布局。玄玄血傀師取得長生藥，肆無忌憚的執行著對聖魔報復的計畫，想要成為聖魔主宰。所幸天踦爵挺身而出，率群俠抵抗血傀師所帶動的黑暗勢力，並在最後與血傀師決一勝負。59岁的丹尼尔·布莱克是个木匠，由于心脏问题，他生平第一次需要申请社会救济。尽管他的医生禁止他继续工作，但他依然决定冒着被罚款的风险找一份工作。在他反复前往“就业中心”求职的过程中，他结识了凯蒂，一位需要照顾两个孩子的单身母亲。为了不让孩子流落到儿童福利院，她不得不住在一间离自己出生地450公里远的住房内。当今英国行政机构的繁琐程序就像一张网，牢牢套住两人。丹尼尔和凯蒂决定尝试相互帮助……Black line: jiuxiong* …Move the mouse to the left margin of the last paragraph of the document and double-click the left mouse button to select the paragraph. Opens the Column Dividing dialog box. By default "three columns", Word documents have not changed to three columns according to the original setting, but only two columns of text, and some documents have only one column after three columns are typesetted under the same circumstances. Why is it normal to "column typesetting" other paragraphs of the document, while the same operation will cause problems in the last paragraph of the document?R1 + Button-Special Skills: