When the truss is large such a calculation of a relative displacement by the laws of geometry becomes excessively tedious.
当桁架很大时，根据几何学定律来计算相对位移就会变成很麻烦的事。
Solutions to problems in descriptive geometry such as finding the relative positions between straight lines between a straight line and a plane, and between planes are found by computerized graphics.
本文介绍用计算机求解画法几何中直线与直线、直线与平面及平面与平面的相对位置问题的方法和程序设计。
In metal cutting, tools and workparts must have certain relative movements during processing in order to achieve geometry needed. The movements include main movement and feed movement.
金属切削技术是利用各种不同的加工方法去除工件材料，获得最终所需的几何形状。
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