keystone

字典網

英文解釋：

名詞 keystone:

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

例句：

1. The keystone in the crown of an arch.
   拱頂石位於拱頂的塞縫石
2. A wooden frame built especially to support the sides of an arch until the keystone is positioned.
   支拱板條專門用來在拱頂石放置好以前支撐拱的兩邊木架子
3. Belief in a life after death is the keystone of her religious faith.
   她的宗教信仰的基礎是相信死後有來生。