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刨根究底
Pinyin: páo gēn jiū dǐ

Explanation: 比喻追究底细。同“刨根问底”。

No. 2
　　See "inquisitive."
Translated by Google
Thesaurus
run to ground, an inquiring (turn of) mind, plate Make a thorough investigation of basio-, Sougentichi, Digging to find the source of the, Pursuit ray tracing