盘根问底

pan2 gen1 wen4 di3

lit. to examine roots and inquire at the base (idiom); to get to the bottom of sth

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盘根问底

pán gēn wèn dǐ

cross-examine details

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盤根問底|盘根问底 [pán gēn wèn dǐ] ► lit. to examine roots and inquire at the base (idiom); to get to the bottom of sth