1. 青年：youthfully 年轻地 | youthfulness 青年 | youthhood 青春期

2. 坚实漂亮：And the aging and sad passing away of every inch of life 每一寸生命的伤逝 | Will contribute to the age-old truth of the world's 都凝成亘古真谛 | Youthfulness- 坚实漂亮

noun

1. the freshness and vitality characteristic of a young person

Synonym: youthjuvenility