umbilic bracelet造句

例句与造句

1. John Robinson created a sculpture " Eternity " based on the shape in 1989, this had a triangular cross-section rather than a deltoid of a true Umbilic bracelet.
2. The equivalence classes of such cubics under uniform scaling form a three-dimensional real projective space and the subset of parabolic forms define a surface  called the umbilic bracelet by Christopher Zeeman.
3. It's difficult to find umbilic bracelet in a sentence. 用umbilic bracelet造句挺难的