医生检查了他的脚弓是否有拉伤迹象。

The doctor checked the ___arch of his foot for signs of strain.

拱门是古老建筑的标志性特征。

The ___arch is a signature feature of ancient architecture.

这座古老的石拱桥已经屹立了数百年。

The ancient stone ___arch bridge has stood for centuries.

彩虹在天空中形成了一道美丽的弧线。

The rainbow ___arched beautifully across the sky.