The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...

摆逆运动中与动切成定,其包络是圆周渐.

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

旋转肾脏和旋转三瓣外摆，且彼此维持正交。