nonachievableWiktionary 原文构词拆分non-前缀Used in the sense of no or none, to show lack of or failure to perform; or in the sense of not, to negate the meaning of the word to which it is prefixed.+achievable词根/词干词源说明From non- + achievable.释义（英文）形容词 AdjectiveNot achievable; unachievable.