arch form

例句：

1. 1.The cat sat on the arched roof of the house.
   那只猫坐在房子的拱形屋顶上。
2. 2. The bridge is made of arched stone.
   这座桥是用拱石建造的。
3. 3. The arched entrance leads to a secret garden.
   拱形入口通向一个秘密花园。