For example, the basic skills of changing knives and shredding potatoes must be consistent in length and thickness, almost 2mm thick. Furthermore, you can try to boneless a grass carp and replace it with fillets. How long does it take, and the thickness of the fillet must be the same ... by the way, my family runs a restaurant. These are the basic requirements for changing knives ... the restaurant emphasizes quality and speed. Sometimes speed is more important than quality. In short, a major is a major.