这个圆形广场的设计突出了其形状的完美圆形。

The design of this round square highlights the perfect ___circularity of its shape.

他的论证陷入了循环论证的谬误，因为前提已经包含了结论。

His argument suffers from ___circularity since the premise already includes the conclusion.

这个生态系统的循环性保证了资源能够不断被重新利用。

The ___circularity of this ecosystem ensures resources are continuously reused.