精益求精

On the HSK 7-9 vocabulary list, at CEFR level C1.

jīngyìqiújīng ㄐㄧㄥ ㄧˋ ㄑㄧㄡˊ ㄐㄧㄥ

    • to constantly seek to improve to keep perfecting

      idiom

Character by character

Sources