cusped

Construct rotating nephroid and three-cusped epicycloid while remaining orthogonal to each other.

作旋转的肾脏线和旋转的瓣外摆线，且彼此维持正交。

Trityldon(Greek for 3 cusped tooth) was a species of tritylodont, one of the most advanced group of cynodont therapsids.

兽是兽科中的一属，而兽类是犬兽类中最先进的一群。