Word: 一成不变 (yīchéngbùbiàn) Traditional: 一成不變 一成不变 dictionary entry yīchéngbùbiàn immutable Full dictionary entry for 一成不变 Example sentences using 一成不变 2 sentences, showing page 1 of 1. 规定不是一成不变的。 Guīdìng bú shì yìchéngbúbiàn de. Rules are not set in stone. 规定不是一成不变的，可以改。 Guīdìng bú shì yìchéngbúbiàn de, kěyǐ gǎi. Rules aren't set in stone; they can be changed.