dome

verb [vt. 及物动词]变圆，膨胀；加穹顶（状物）于

The use of steel and concrete has allowed the builders to perch a light concrete dome on eight slender columns. ^{钢筋混凝土的使用使建筑者们能将一个轻巧的混凝土穹顶架在8根细柱上。}