projective ranges of points

例句：

1. 1.The projective ranges of points are used to determine the distance between two points on a plane.
   点向量用于确定平面上两点之间的距离。
2. 2. The projective geometry is a branch of mathematics that deals with the properties of shapes and their projections.
   射影几何是数学的一个分支，研究形状及其投影的性质。
3. 3. In projective geometry, lines are considered parallel if they do not intersect each other.
   在射影几何中，如果两条直线不相交，则认为它们是平行的。