[N-COUNT 可数名词]拱顶石 A keystone is a stone at the top of an arch, which keeps the other stones in place by its weight and position.
[TECHNICAL 术语]
2
[N-COUNT 可数名词](政策、体系或进程的)基础,主旨 A keystone of a policy, system, or process is an important part of it, which is the basis for later developments.
[usu sing]
Keeping inflation low is the keystone of their economic policy.
将通货膨胀率保持在较低水平是他们经济政策的主旨。
Oxford
key·stone/ˈkiːstəʊn; NAmEˈkiːstoʊn/noun1( architecture 建) the central stone at the top of an archthat keeps all the other stones in position 拱顶石2[usually singular ]the most important part of a plan or argument that the other parts depend on (计划、论据的)主旨,基础keystonekeystoneskey·stone/ˈkiːstəʊn; NAmEˈkiːstoʊn/
LDC
keystonekey‧stone /ˈkiːstəʊn $ -stoʊn/ noun
word sets
1[countable] the large central stone in an arch that keeps the other stones in position2[singular] formal the most important part of an idea, belief, or process that influences how it developskeystone of The keystone of any personal injury case is medical evidence.
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