Master teaches. It was taught by the master. You can't learn this in two or three years. Five-axis CNC machine tools belong to five-axis linkage. In other words, the knife is moving and the workbench is moving. In addition, not only XYZ but also AB are linked, so programming is very difficult. In this way, the apprentice is completely different from the three axes in the learning process. Especially programming, after three years of hard study, you can learn to be a teacher.