normal plane

• 垂直面,法向面

normal plane的用法和样例：

例句

1. Light can be trusted to curve only in a vertical plane.
   可确信光线仅在垂直面内作曲线传播。
2. The winner is the athlete whose torso breaks the vertical plane of the finishing line first.
   第一个用身体躯干冲过终点垂直面的人为优胜者。