illustration space geometry problem 图解空间几何问题
When solving a solid geometry problem, if we transform the problem into space vector, we shall get twice the result with half the effort.
在解答立体几何问题时，若能把立体几何问题转化为空间向量的运算，解答起来会收到事半功倍的效果。
The 3-d space robot collision-free trajectory planning problem, by means of geometry-graphics method in 2-d space, is resolved.
借鉴二维空间的几何图形法解决了三维空间机器人无碰撞轨迹规划问题。
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