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Open the tool →一定不易 (yī dìng bù yì) is a Chinese idiom (chengyu) meaning “Unchangeable”.
一定不易 is pronounced yī dìng bù yì in Mandarin Chinese.
Literally, 一定不易 means “Fixed and unchangeable”. It is used to mean “Unchangeable”.
易:改变。原指一定下来就不变更,后形容事理正确,不可改变。