1. A wooden frame built especially to support the sides of an arch until the keystone is positioned. 
   支拱板条专门用来在拱顶石放置好以前支撑拱的两边木架子
2. To furnish(an arch) with a keystone. 
   用拱顶石装饰（拱顶）
3. The keystone in the crown of an arch. 
   拱顶石位于拱顶的塞缝石
4. Belief in a life after death is the keystone of her religious faith. 
   她的宗教信仰的基础是相信死後有来生。
5. inertial frame of reference 
   惯性参考系

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