史无前例

Explanation: History has never had to do. Means unprecedented. 　　Usage: The main predicate; as the predicate attribute; for the important things 　　Source: Qing Qiu, "sea of clouds at House of Poetry comes Ridge": "the first person to prison off the article, what day of the door wings actually due? Years without precedent in mind note, all cardinals have Yao Jin." 　　Examples: Now the wealth gap is ~; now enjoy the entertainment but also to ~. (Qing "on the front and care") 　　Riddle: New record Thesaurus:  be never known before and never to occur again, never hear in past history, unheard-of, peerless Antonym Group:  continuously or incessantly, (as) thick as hail, Continuum continuous, Continuous Without a break, continue continuous