As the name implies, iterator pattern is to access objects in an aggregation sequentially. Generally speaking, it is very common in collections. If you are familiar with collection classes, it will be very easy to understand this pattern. This sentence contains two meanings: one is the object that needs to be traversed, that is, the aggregated object, and the other is the iterator object, which is used to traverse the aggregated object. Let's look at the diagram:
If you pass the re-examination, you will pass the physical examination. After passing the political examination, the examinee can fill in the Air Force Flight Academy in the college entrance examination. As long as the test score exceeds the minimum undergraduate admission line, you can be admitted. The two levels of political review and achievement are relatively easy to pass.
二战爆发的时候，比尔九岁。他和他的父母，姐姐和妹妹住在伦敦郊区的一栋房子里。父亲很快应征入伍，临走前他教会了儿子板球里“欺骗”对手的曲线球。频繁的空袭使得生活慌乱不安，而孩子们却对这些景象感到兴奋。人们也逐渐适应了这样。
For this reason, we can encapsulate a global publish-subscribe mode object. The following code:
人级就是一般的，地级就说明事情比较重要，比如之前的巴蜀之战就要是如此。
故事开始于上世纪70年代末北方某农场，生性顽劣的干部子弟雷雷（邓超饰）邂逅被污破鞋的美丽女知青叶青儿（孙俪饰），两人不打不成交，开始一段两小无猜的纯洁友谊，由此暗生情愫，对邓丽君《甜蜜蜜》的共同喜爱使两人青涩的爱情开始萌动。
Belgium: 30,000
那个城门在哪里？秋霜小眼一瞪道：你就这么跑，那不是送上门让人捉？城门口好些差大爷看守，他们可厉害了，那天来我们家翻了个底朝天呢。
她便就这么含着泪水对窗下的大哥大姐笑，又用力地挥手，示意他们快走，不用担心自己。
郑长河仰面向天，固执地说道：我不管。
跟着板栗葫芦等人去了下塘集。
师傅，我们去……陈启报了一家高档饭店的名字。
4? Distributed attack
这一刻，尹文倩还在笑，但是她的小脸蛋小嘴巴真得有些抽筋了，所以这时的笑容，或者说，表情真是非常诡异奇怪，而且她的头发有些散了，衣服也有些凌乱，眼中还带着泪水。
Efficient DDoS Attack Detection and Analysis Tool FastNetMon
