projective subspace

例句：

1. 1. In computer graphics, a projective subspace is a set of pointsin a three-dimensional space that canbe mapped onto a two-dimensional image.
   在计算机图形学中，一个投影子空间是三维空间中的一组点，这些点可以映射到二维图像上。
2. 2. The projective subspace of the plane contains all linesthat pass through the origin and are parallelto the x-axis.
   平面的投影子空间包含所有通过原点且与x轴平行的直线。
3. 3. The projectivesubspace of a vector space is theset of vectors that can be expressedas linear combinations of other vectors inthe space.
   向量空间的投影子空间是所有可以表示为该空间其他向量线性组合的向量的集合。