一成不變

Simplified: 一成不变

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

yīchéngbùbiàn ㄧ ㄔㄥˊ ㄅㄨˋ ㄅㄧㄢˋ

    • immutable impervious to change set in stone

      idiom

Character by character

Sources