splaying arch

例句：

1. 1. The ancient city is built on a splaying arch.
   这座古城建在拱形结构上。
2. 2.The dome of the cathedral is a marvel of splaying arches.
   大教堂的圆顶是拱形结构的奇迹。
3. 3. The structure's design is inspired by the natural splaying arches of the mountain.
   该结构的设计灵感来源于山脉自然形成的拱形结构。