crown of arch

• 拱顶,拱冠

crown of arch的用法和样例：

例句

1. The vault of this cathedral is very high.
   这座天主教堂的拱顶非常高。
2. We hope to see you become a keystone of the intellectual community.
   我们希望看到你们成为知识界的一块拱顶石。