| 释义 |
keystone
—keystone /ˈkiː.stəʊn/ aep /-stoʊn/
Ⅰ noun [C] (IMPORTANT PART) ► F0 the most important part of a plan, idea, etc. on which everything else dependsThesaurus+: ↑Important and essential things , ↑Information and messages
Ⅱ noun [C] (STONE) ► F0 the middle stone in the top of an arch that has a special shape and holds all the other stones in positionThesaurus+: ↑Arches, columns and beams |