| 单词 | keystone |
| 释义 | key·stoneBrE /ˈkiːstəʊn/ NAmE /ˈkiːstoʊn/ noun (architecture建筑) the central stone at the top of an archthat keeps all the other stones in position 拱顶石[usually sing. ]the most important part of a plan or argument that the other parts depend on （计划、论据的）主旨，基础 |
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