1. The copestone of the building was intricately carved with beautiful designs.

这座建筑物的顶部石料被精美地雕刻成漂亮的图案。

2. The architect carefully selected the perfect copestone for the roof, ensuring its stability and durability.

建筑师精心挑选了这个屋顶的理想顶石，确保其稳定性和耐久性。