As the year draws to a close, people feel the footsteps of time, loud, rapid, and without hesitation. On ordinary days of the year, people would not hear this sound. This feeling is really amazing, because except for an artificially set calendar (time scale), nothing else has changed. People’s perception of time has many subjective and personal characteristics. When you are young, time seems slow; when you are older, time seems faster. When I was in elementary school, each year passed so slowly. I often thought, when will I grow up? After retirement, each year passes quickly, and ten years are just a blink of an eye. When you are…