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In practice, we often see some of the most advanced groups of spammers trying to derail Gmail filters by reporting a large amount of spam as non-spam. As shown in the figure, from the end of November 2017 to the beginning of 2018, there were at least four large-scale malicious actions trying to distort our classifier.这我服，我一辈子也胜不过你。Factory method: Create a single object, which is used in Abstract Factory.林思明和郭寒，笑容满面。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:　　玉皇天帝和王母有三个女儿，大女儿斯冰，是掌管冰雪的女神，她性情暴虐偏执，动不动就施法惩罚别人，众神都对她敬而远之。二女儿旱拔，其貌不扬，却是个花痴，整天追逐男神，众神都对她避之不及。三女儿丝音是玉帝最小的女儿，也是玉帝和王母最疼爱的女儿，她生性活泼，清纯可爱，人见人爱，对人间诸事都很好奇。It was the Spring Festival. Everyone around me is robbing red envelopes, panning for New Year's goods, buying tickets and buying all over the world... Who would have thought that my peers are in Shanghai, which is famous for postage, and cannot enjoy the convenience of online life, just because there is a "dot" in her name.