测量直线度、平行度和垂直度。
针对三维转动的不平行度和激光散斑的影响，提出了激光刀口斜率拟合校正法。
To overcome the impacts of nonparallelism of 3d rotation and laser speckle on the accuracy of measurement, modification is made by slope fitting of the laser blade.
只有在平坦的宇宙中，空间才符合标准的几何规律——三角形的内角和精确地等于180度，平行线永远不相交。
Only in a flat universe does space obey all the standard geometry-class rules-the angles of a triangle add up to exactly 180 degrees and parallel lines never meet.
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