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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.Noun Explanation:地处昆嵛山区腹地的孔家镇乃胶东重镇，交通便利，经济繁荣。大地主兼大资本家孔庆儒身兼区长和校董等职，拥有军警宪特和私人武装，在孔家镇可谓一言九鼎，为所欲为。在远离孔家镇的“世外桃园”桃花沟，蚕农张老三家养了三个天仙般美丽的女儿。大女儿好儿尤以羞花闭月、沉鱼落雁的美貌远近闻名，二女儿桃子也到了谈婚论嫁的年龄。故事就从桃花沟开始发生了　　畹町桥是中缅两国交界河上的界桥，于1938年抢修滇缅公路时初建，是当时中国对外联系的重要国际交通口岸。1942年，中国十万远征军从畹町桥出境，赴缅作战，抗击日军，在对日作战岁月里沉重打击了日本侵略者，创造了辉煌的抗战历史。Damage superposition cannot prolong the duration. After the first trigger time arrives, the same type of poisoning will be forced to end and other types of poisoning will be disturbed at the end. The poisoning of teammates adds up, and time does not affect each other.