Solve several common problems of coffee machine summarize what you must know as a good non-teacher

Summary of common problems and treatment methods of coffee machine because of the existence of coffee machine, people are able to taste delicious coffee in a relatively short time. They do not realize that when using a coffee machine, there are sometimes some problems that hinder the barista's process of making coffee. Experienced baristas naturally take no effort to deal with some simple failures, but for beginners, these problems are also