1 to have never met sb before (idiom); entirely unacquainted
2 a complete stranger
3 not to know sb from Adam
素面朝天
sù miàn cháo tiān
1 lit. to present oneself confidently to the emperor, without makeup (as did the sister of Yang Guifei 楊貴妃|杨贵妃[Yáng Guì fēi]) (idiom)
2 fig. (of a woman) to show one's natural features, without makeup
3 to present oneself just as one is, without artifice
艰苦朴素
jiān kǔ pǔ sù
1 leading a plain, hardworking life (idiom)
行行出状元
háng háng chū zhuàng yuán
1 lit. in every trade, a master appears (idiom); fig. You can produce outstanding achievements in any task, provided you put it enough love and diligence
轻饶素放
qīng ráo sù fàng
1 easily forgive, simply release (idiom); to let sb off scot free