normal line

• 垂直线

normal line的用法和样例：

例句

1. The vertical line meets the horizontal one here.
   垂直线与水平线在此相交。
2. "A science fiction cannot not be regarded as a mere entertainment, but in fact it tells the reader much more."
   "科幻小说不能简单地看成是供消遣的，而实际上它给读者展示更深刻的内容。"
3. This is necessary for normal mapping to work.
   这是法线贴图运作时所必须的。
4. Vertex format includes a vertex normal vector.
   顶点格式包括顶点法线向量。