1, handed down from generation to generation: in ancient times, it was a metaphor for tired bones but immortal spirit; Later generations use it to describe the knowledge and skills passed down from generation to generation.

2. Synonyms: connecting the past and the future, handed down from generation to generation, in the same strain, connecting the past and the future.

3. Source: Zhuangzi. Living the Lord ":refers to poverty as a salary, fire spreads, and I don't know what to do." The original wood was burned out, but the fire can still be passed on.