He went under a brick arch.

他从一座砖拱门下面走过。

《柯林斯英汉双解大词典》

That invention was the arch, a curved structure originally made of separate stone or brick segments.

这一发明就是拱门，一种最初由分段的石头或砖块组成的弧形结构。

youdao

The crawl space beyond had a floor of unpainted, unvarnished wood, and narrow walls of brick. The three-foot ceiling was curved in an arch. It looked like a chimney lying on its side.

另一面的管道地板是没有漆过的木板，两边是窄窄的砖墙。三尺宽的天花板弯曲成拱形。看上去像一个横放着的烟囱。

youdao

"It wants to be an arch, " he would reply, making the brick's structural logic and expressive potential immediately and magically clear to anyone who heard him.

WSJ: Seeking the Father, Finding the Architect