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Chinese idiom, Pinyin is p á ng ē NW è nd ǐ, which means to interrogate and investigate the cause of things. It's from flowers in the mirror.
Idiom explanation
Ask: ask carefully; ask: ask.
The origin of Idioms
The 44th chapter of Jing Hua Yuan written by Li Ruzhen in Qing Dynasty: "although the ocean of Wu Ru Lin has been abroad for several times, I don't pay attention to everything. I don't know much about it. I've been asked by the hills. I'll talk about it today and tomorrow. All the allusions in my stomach have been finished for a long time."
Idiom usage
As predicate and object, it is the same as "probing into the bottom".
Examples
He made a thorough inquiry and had to find out.
Chinese PinYin : pán gēn wèn dǐ
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be delivered from oppression. chóng dǔ tiān rì