斤斤

jīn jīn yú xì zhī mò jié

斤斤于细枝末节

be fastidious about details

bù yào jīn jīn yú biǎo miàn xíng shì ér yīng zhù zhòng shí jì wèn tí

不要斤斤于表面形式，而应注重实际问题。

Don't be particular about appearances. We should pay more attention to the substance.

tā jīn jīn yú zì jǐ de lì yì

他斤斤于自己的利益。

He is alive to his own interests.