这个游泳池设计成椭圆形，非常独特。

The swimming pool has an ___elliptical shape, which makes it quite unique.

教授的回答太过简略含糊，我们都没听懂他的意思。

The professor's ___elliptical answer was too brief for us to understand.

健身房的椭圆机对关节很友好。

The ___elliptical machines at the gym are easy on your joints.