| 单词 | keystone |
| 释义 | keystone —keystone /ˈkiː.stəʊn/ aep /-stoʊn/ 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 messagesnoun [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 |
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