octagonal hammer

例句：

1. 1. The building is designed with anoctagonal shape.
   这座建筑是设计成八角形的。
2. 2. Theoctagonaltable has eight legs.
   这个八角形桌子有八条腿。
3. 3. Theoctagonal roof of thepalace is unique.
   宫殿的八角形屋顶非常独特。