keystone

名词 keystone:

1. a central cohesive source of support and stability
   同义词：anchor, mainstay, backbone, linchpin, lynchpin
2. the central building block at the top of an arch or vault
   同义词：key, headstone

1. The keystone in the crown of an arch.
   拱顶石位于拱顶的塞缝石
2. 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
3. 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。

key.stone

n.（名词）
Architecture The central wedge-shaped stone of an arch that locks its parts together.Also called headstone
【建筑学】 拱顶石，塞缝石：拱的中部楔形石头，使拱的各个部分连在一起也作 headstone
The central supporting element of a whole.
基础、主旨：整体的一个中心基本原则