never seen since ancient times
方滋未艾 still growing strong; on the up; 亘古未有 never seen since ancient times; unprecedented 旷古未闻 ; unprecedented; never before in the whole of history (idiom) ..
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never seen since ancient times
自古以来从未见过
以上为机器翻译结果，长、整句建议使用 人工翻译 。