circular arch rule

例句：

1. 1. The circular arch in thecenter of the bridge is a symbol ofthe city's architectural style.
   桥中心的圆形拱门是这座城市建筑风格的代表。
2. 2. Thecircular arch was designed to protect pedestriansfrom traffic accidents.
   圆形拱门的设计是为了保护行人免受交通事故的伤害。
3. 3. The circulararch is an important elementin the design of the bridge, adding a sense of grandeurand elegance.
   圆形拱门是桥梁设计中的重要元素，增添了一种宏伟和优雅的感觉。