nuclei arciformes

例句：

1. 1. The dinosaurs were the first known animals with arciform bodies.
   恐龙是已知的第一种具有环形身体的动物。
2. 2. The fossilized remains of these ancient creatures are often found in arciform structures.
   这些古代生物的化石通常在环形结构中被发现。
3. 3.The discovery of this species has sparked renewed interest in the study of arciform organisms.
   这种物种的发现重新激发了对环形生物研究的兴趣。