keystone

美 [ˈkiˌstoʊn]
英 [ˈkiːˌstəʊn]
  • n.拱顶石;基础
  • adj.吉斯通式的
  • 网络拱心石;凯斯通;重点
复数:keystones  
KEYSTONE
n.
1.
拱顶石the central stone at the top of an arch that keeps all the other stones in position
2.
[ususing]
(计划、论据的)主旨,基础the most important part of a plan or argument that the other parts depend on

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