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BNC: 21380 COCA: 17516
keystone
noun [C] [usually singular] /ˈkiːˌstəʊn/
singularkeystone
pluralkeystones
Related words
  1. 1
    something that is very important to a plan, arrangement, or set of beliefs (计划、安排或信仰的)基础,基石,主旨
     Synonyms and related words
    Important thing or detail: feature, priority, element...
  2. 2
    a stone at the top of an arch that keeps the structure together 拱顶石
     Synonyms and related words
    Frames and supports for structures: frame, foundation, support...
BNC: 21380 COCA: 17516
BNC: 21380 COCA: 17516

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