yingyingwp
用在前面的语句可以是It's the first time that…. 用在后面的语句可以是…which never see/happen before.
年~you(yu)
前所未有 [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.