Nor: Uses the direction of the normal vector as coordinates. This is very useful when creating certain special effects (see below).
法向： 使用法向量的方向作为坐标。这在创建某些特效时非常有用（见下文）。
2
Coordinates to install the surveillance, the Vyborg personnel and should receive money special commissioner and the business agent and the client coordinated work.
配合安装监督、维保人员及应收款专员与代理商和客户的协调工作。
3
Expressions of velocities and accelerations in usual coordinates are simply derived by means of the composition formulae of velocity and acceleration in special rotation reference systems.