一成不变

nothing much changes (idiom); always the same / stuck in a rut

(idiom) immutable; impervious to change; set in stone

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

surname Cheng

to succeed / to finish / to complete / to accomplish / to become / to turn into / to be all right / OK! / one tenth

no; not so / (bound form) not; un-

constant / unvarying / (math.) invariant

to change / to become different / to transform / to vary / rebellion