| 释义 |
key·stoneBrE /ˈkiːstəʊn/NAmE /ˈkiːstoʊn/ noun(architecture 建筑) the central stone at the top of an arch that 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 |
