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| 单词 | keystone |
| 释义 |
keystone UK ['ki:.stəʊn] US [-stoʊn] noun countable STONE 石 ■the middle stone in the top of an arch which has a special shape and holds all the other stones in position 拱顶石；塞缝石 UK ['ki:.stəʊn] US [-stoʊn] noun countable IMPORTANT PART 基础 ■the most important part of a plan, idea, etc. on which everything else depends （计划、想法等的）基础，主旨，基本原则 |
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