yì一onechéng成becomebú不notbiàn变change
Unchanging; static; set in stone.
Literal meaning
one (一) — become (成) — not (不) — change (变)
Origin
A classical four-character phrase describing something that does not change.
Examples
shì世jiè界zài在bù不duàn断biàn变huà化，méi没yǒu有shén什me么shì是yì一chéng成bú不biàn变de的。
The world is constantly changing, and nothing is set in stone.
tā他de的guān观diǎn点yì一chéng成bú不biàn变，hěn很nán难shuō说fú服tā他。
His views are unchanging, and it is difficult to persuade him.
Usage & nuances
Often used in a negative context, implying rigidity or resistance to change.
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