first-ever

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌfirst-ˈever adjective [only before noun]  FIRSThappening for the first time 第一次的 her first-ever television interview 她的第一次电视采访 the first-ever visit to China by an American president 美国总统的首次访华

Examples from the Corpus

first-ever• Released 25 years ago, the recording became the unofficial anthem of my first-ever election campaign.• According to the official program of the Games, it was the first-ever Olympic triathlon.• However, this is by no means the first-ever space station.

ˌfirst-ˈever adjectiveChineseSyllable  

time the first happening Corpus for

first-ever
ˌfirst-ˈever adjective [only before noun]
happening for the first time:
    her first-ever television interview
    the first-ever visit to China by an American president

first-everBrE /ˌfɜːst ˈevə(r)/ 🔊NAmE /ˌfɜːrst ˈevər/ 🔊 adjective [only before noun] never having happened or been experienced before 首次的◆his first-ever visit to London他对伦敦的初次访问◆the first-ever woman vice-president第一位女副总统