| 释义 |
keys.toneH5ki:7stEJn, $-stoJnn [C]the middle stone in the top of an arch which has a special shape and holds all the other stones in position, or (fig. ) the most important part of a plan, idea, etc. on which everything else depends拱顶石;基础;主旨;基本原则The keystone of the entrance arch is decorated with the date it was built.入口拱门的拱顶石上装饰着建造的日期。(fig. ) Japan's co-operation was the keystone in developing the regional agreement.日本的合作是发展地区和睦的基础。[KEY ]
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