unexpiringWiktionary 原文英美unexpiring1词源 1构词拆解unun-前缀expiringexpiring词干un-(added to adjectives or past participles) not · (added to nouns) lack of词源说明From un- + expiring.释义形容词adjective1Not expiring.unexpiring2词源 2释义动词verb1present participle and gerund of unexpire