unprecedentednever seen since ancient times
亘古 throughout timefrom ancient times (up to the present) 亘古未有 unprecedentednever seen since ancient times 古 surname Guancientold ..
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unprecedentednever seen since ancient times
这是自古以来从未有过的
以上为机器翻译结果，长、整句建议使用 人工翻译 。