Drilling mountains and blocking seas
As a Chinese idiom, Pinyin is Zu à NSH à ns à IH à I, which means doing extremely difficult things. From Sha Ting's gold rush II.
The origin of Idioms
Sha Ting's "gold rush" 2: "as long as you do, I always come to one."
Idiom usage
Used as an attributive or adverbial; used in writing
Drilling mountains and blocking seas
A single tree does not make a forest - dú mù bù chéng lín
change from arrogance to humility - qián jù hòu bēi
advantageous to both public and private interest - gōng sī liǎng biàn