盘根究底穷根究底；寻根究底pán gēn jiū dǐask about everything in great detail;dig out the bottom truth (/cause); get down to the bedrock;get to the bottom (/root) of things (/the matter);inquire (/probe) deeply into sth; try to get to the heart of a matter
❍ 如今桃叶自己挑中了一个人，妈妈四出访问，～打听了两个多月，觉得女儿的眼头确实不错，这才点了头。(王汶石《风雪之夜》165) Now Taoye had found herself a young man and Ma spent two months asking people all about him. She was finally satisfied with her daughter's choice and gave her approval. 盘根究底底（柢）pán ɡēn jiū dǐ盘：盘问；究：追究。追究事情的根由和底细。get the bottom of the affair, get to the heart of a matter, close questioning |