| 词汇 | keystone |
| 释义 | keystone noun [ C ] uk/ˈkiː.stəʊn/ us/ˈkiː.stoʊn/ (STONE) architecture specialized拱顶石;塞缝石 the middle stone in the top of an arch that has a special shape and holds all the other stones in position (IMPORTANT PART) （计划、想法等的）基础，主旨，基本原则 the most important part of a plan, idea, etc. on which everything else depends |
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