upperWiktionary 原文中文来自 ECDICTadj.上面的，较高的，上级的，上院的，穿在外面的，北部的，地表的，后期的n.鞋帮，上齿构词拆分up词根/词干+-er后缀(added to verbs) A person or thing that does an action indicated by the root verb; used to form an agent noun. · (added to verbs, informal) A person or thing to which the root verb is done or can be done satisfactorily.演变路径（由近及远）英语继承自 ←中古英语 upper词源说明Inherited from Middle English upper. By surface analysis, up + -er.释义（英文）形容词 AdjectiveAt a higher physical position, level, rank or order.Situated on higher ground, further inland, more upstream, or more northerly.(geology, of strata or geological time periods) Younger, more recent.(education) Of or pertaining to a secondary school