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1. Oxford Dictionary

   keystone

   • IPA[ˈkiːstəʊn]

   英式

   • n.
     a central stone at the summit of an arch, locking the whole together.；the central principle or part of a policy, system, etc., on which all else depends

   • noun: keystone, plural noun: keystones

2. • 釋義
   • 相關詞

   n.

   名詞

   • 1. a central stone at the summit of an arch, locking the whole together. 同義詞 cornerstone, central stone, quoin
   • ▪ the central principle or part of a policy, system, etc., on which all else depends cooperation remains the keystone of the government's security policy 同義詞 foundation, basis, linchpin, cornerstone, base, ... 更多principle, guiding principle, core, heart, centre, crux, fundament, mainspring, priority

   Keystone State

   • ph.
     a name for Pennsylvania

   Oxford American Dictionary

   Keystone State

   • ph.
     a name for Pennsylvania

   Oxford Dictionary

   keystone species

   • n.
     a species on which other species in an ecosystem largely depend, such that if it were removed ...

   Oxford American Dictionary

3. • 更多解釋

   keystone

   • IPA[ˈkēˌstōn]

   美式

   • n.
     a central stone at the summit of an arch, locking the whole together.

   Oxford American Dictionary

   Keystone

   • IPA[ˈkiːstəʊn]

   英式

   • a US film company formed in 1912, remembered for its silent slapstick comedy films, many ...

   Oxford Dictionary