青春

例句：

1. 1. She is at her prime as a singer.
   她作为歌手正处于巅峰时期。
2. 2. The youth are the future of our country.
   年轻人是我们国家的未来。
3. 3. They were young and full of energy when they started their business.
   他们开始创业时还很年轻，充满活力。