trace to the very source of sth.
It is a Chinese idiom with a Pinyin of Qi ó ngyu á ns ù Li ú, which means to explore and trace the origin of things. From modern Chinese dictionary, 5th Edition.
Idiom explanation
Metaphor explores and traces the origin of things.
The origin of Idioms
Modern Chinese dictionary, 5th Edition.
trace to the very source of sth.
This is tolerable, which is intolerable - cǐ ér kě rěn ,shú bù kě rěn
A full man knows not a hungry man - bǎo hàn bù zhī è hàn jī