一定不易yī dìng bù yìonce it is decided,it cannot be changed
❍ 他说～，你能劝劝他吗？He said that once it is decided it cannot be changed. Will you try to persuade him? 一定不易yī dìnɡ bù yì易：更改，改动。形容一经确定下来就不再改动；也指事理正确不可改动。unalterable, once it is decided it cannot be changed |