Watching the class twice at twice the speed is more beneficial to learning than watching the class once at normal speed.

Training is training+training, which enables trainees to master certain skills. Domestic training mainly focuses on skills training, focusing on early behavior. In order to achieve unified scientific and technical norms and standardized operations, it is called training to enable trainees to reach the expected level and improve their goals, combat effectiveness, personal ability and work ability through modern information processes such as goal planning, knowledge and information transmission, skill proficiency drills, homework performance evaluation and results exchange announcement.