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BNC: 21380 COCA: 17516

keystone

noun
/ˈkiːstəʊn/
/ˈkiːstəʊn/
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  1. (architecture建筑) the central stone at the top of an arch that keeps all the other stones in position拱顶石
    Topics Buildingsc2
  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
    • Changes to the welfare system are the keystone of the government’s reforms.福利制度的改革是政府改革的重点。
    Topics Opinion and argumentc2
BNC: 21380 COCA: 17516
BNC: 21380 COCA: 17516
BNC: 21380 COCA: 17516
keystone
Important thing or detail: feature, priority, element...
Frames and supports for structures: frame, foundation, support...

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