From beginning to end, from beginning to end, this is a good time to struggle. Metaphor bones, immortal spirit; Later generations use this as a metaphor for knowledge and skills passed down from generation to generation; Struggle for the youth at that time means that the pace of youth does not stop, and it is time to struggle. This is because youth is the best time in a person's life, and it is also the time when people are most energetic and have the strongest ability to absorb knowledge, so we should not stop moving forward when we are young. Work hard, walk the line, and greet your bright tomorrow with the hard sweat of youth.