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单词 keystone
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
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