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This is very important4. The construction of the teaching staff and the control of the quality of teachers;So now, originally one object was responsible for instantiating all specific classes, now through some changes to the PizzaStore, a group of subclasses are responsible for instantiating specific classes: the subclasses of FactoryPizzaStore are responsible for implementing CreatePizza;Stance, my recent favorite, Because I have been wearing sneakers, Therefore, I prefer to buy all kinds of good-looking socks. Some time ago, I found that this sock brand is completely like opening up a new world. There are too many kinds and colors, and there are too many good-looking socks. These are some of the ones I have collected. I wear the L size of Kids just right. This helps save money. There are also L sizes. Obviously, it will be large but I also want to buy them back, because I like the pattern, alas.公子看的很透，不过我的苦难，公子还是低估了。