drafting board

1. According to the nature of projective scale, it has solved the problem of drawing a cars perspective when perspective vanishing point is out of the drafting board.
   文中利用射影几何中射线比的特殊性质，解决了透视灭点在图板外的透视图画法。

noun

1. a smooth board on which paper is placed for making drawings

   Synonym:    drawing board