史无前例英文

史无前例【解释】前例：以前的事例。成语意为历史上从来没有过的事。指前所未有。【出处】清·丘逢甲《岭云海日楼诗抄》：“牢落文章第一人，天门垂翅竟何因？百年记注无前例，万事枢机有要津。”

hitherto unknow

教室里沸腾了- There was pandemonium in the class. 教室里炸开了锅 - It's like bedlam in the class 法宝 - Trump 史无前例 - Unprecedented in history

看来只有查词典了

前所未有 [qián suǒ wèi yǒu] [词典] unprecedented; hitherto unknown; such as never previously existed; [例句]农村出现了前所未有的繁荣。A prosperity never seen before appeared in the countryside.