cycloidal arch

例句：

1. 1. The cycloidalarch is a unique feature of the ancientcity's architecture.
   环状拱门是这个古老城市建筑的独特特征。
2. 2. Thecycloidal arch was designed to provideshade and shelter for visitors.
   环状拱门被设计来为游客提供遮阳和避雨的地方。
3. 3. The cycloidalarch is an important symbol of the city's cultural heritage.
   环状拱门是这座城市文化遗产的重要象征。