Taivo A Taiwan Mandarin dictionary

盤根究底

pángēnjiùdǐ

ㄆㄢˊ ㄍㄣ ㄐㄧㄡˋ ㄉㄧˇ

Simplified 盘根究底

  1. 1lit. to examine roots and inquire at the base (idiom); to get to the bottom of sth

Keep 盤根究底 and it comes back until you know it.

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