The first is security. Nothing will work without security.

The second is the heart. As long as you do things with your heart, you will not achieve your goals and have no regrets.

The third is careful. There are many things that can only be done well by doing things seriously.

The fourth is physical strength. I have done maintenance, I know. I have to move a lot of heavy things during maintenance, and sometimes I have to wheel a sledgehammer, which is quite tiring, so I need to have a good body.

The fifth is observation. There will be many problems in the maintenance process. At this time, only by calming down and carefully observing its structure and principle can it be solved.

As for the appraisal, I only know that welders have professional titles and need exams. Others never seem to hear what is necessary.

As long as I do the above, I can at least do a good overhaul.

Finally, come on.