frist-ever在此如何解
South Koreans at a railway station in Seoul watch a television broadcasting file footage of a previous nuclear test performed by North Korea Monday, October 9, 2006. North Korea said Monday it has performed its first-ever nuclear weapons test, which would confirm that the country has a working atomic bomb as it has long claimed. The writing on the screen read 'North Korea has performed its first-ever nuclear weapons test'. [AP Photo]
学校信息不畅,很想看到朝鲜核试验的图片或影音资料
参考答案:在这里是“首次”的意思。指首次进行核武器试验