capstoneWiktionary 原文中文来自 ECDICTn.顶石构词拆分cap词根/词干+stone词根/词干演变路径（由近及远）英语继承自 ←中古英语 capston词源说明From Middle English capston; equivalent to cap + stone.释义（英文）名词 NounAny of the stones making up the top layer of a wall; a coping stone.(figurative) A crowning achievement, culmination or finishing touch.动词 Verb(transitive) To complete as a crowning achievement; to top off