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After initiating the Pull Request, please send the link of Pull Request to the code reviewer via Email to inform the other party to conduct the review in time. (The BUG repair class must be merged or rejected on the same day, and the functional class or the meeting Review must specify the time and meeting personnel in the email if it feels that there is a major adjustment.)The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.　即将大四毕业的林之校（杨紫 饰）在毕业前夕跌落人生谷底，父亲患癌住院，不得已放弃外地的名企工作机会，和男朋友分手。所有对于爱情和未来生活的美好想象都在这一刻破灭，恰好这时，父亲的主治医生顾魏（肖战 饰）走进了林之校的生活。。。李敬文看着这身材高大、黝黑粗糙的庄稼汉，心里暖暖的，用力点头道：嗳。尹旭看着众人淡淡一笑，说道：既然选择不走，还请诸位坚定信念，切莫三心二意，否则我手中长剑不会容情。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.