Unprecedented means never before, and never again. It is often used to describe some kind of achievement or grand occasion, with exaggerated admiration.
Source: Song Zhuxiang-xian's "Smelling Occasional Records, Men Obeying the Army": "The ancient Mulan, with women as men, joined the army on behalf of her father, and returned twelve years ago, was unknown to her peers, and her poems were beautiful, and the classics were passed down, which was unprecedented in her story."
Translation: In ancient times, Mulan disguised herself as a man and joined the army instead of her father. She didn't come back until 12 years ago. People in the same trade didn't know that she was a girl. It was unprecedented that she was praised by poems and praised by classics.
Extended information:
Synonym
Reach the peak [dēng fēng zào jí]?
Interpretation: Metaphor reaches a very high level.
source: Liu Yiqing's "Shi Shuo Xin Yu Literature" in the Southern Dynasties: "Can I reach the peak without knowing?"
translation: I wonder if this can reach a very high level?
Citation and interpretation: Zhu Ziqing's "The Thirteenth Classic Talk": "By the end of the Qing Dynasty, Mr. Liang Qichao's" new style "was at its peak."
usage: combined; As predicate, object and attribute; Metaphor reaches a very high level.