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Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.There is an important link above: mentor. It used to be like finding a teacher, which probably required thousands of miles to visit. However, in the era of mobile Internet, there is still the need to pay for knowledge. Many people with famous strength have begun to engage in slash occupation-teachers.震惊！懵懂少年在祖坟偶遇修仙大姐姐，身上的怪病竟然奇迹般消失了，还正式踏上了修仙之路。嗯？……30天内必须要结成道侣，否则就会死？在普吉岛的和风煦日中，因为吵架分别多年的童年好友"เต๋" teh (Billkin Butthipong饰演 )和 "โอ้เอ๋ว"oh-aew （PP Krit饰演）在汉语语言学校重聚，因为要申请同一学校的同一专业，他们变成了竞争对手。　　通过诈尸成功逃狱的黑桃Q与特务组织头目黄先生联络，黄先生给他提供了住处。公