例句與造句

1. For elliptical points where the Gaussian curvature is positive the intersection will either be empty or form a closed curve.
2. Most surfaces will contain regions of positive Gaussian curvature ( elliptical points ) and regions of negative Gaussian curvature separated by a curve of points with zero Gaussian curvature called a parabolic line.
3. It's difficult to find elliptical point in a sentence. 用elliptical point造句挺難的