本文主要分析采用数字式测量时，标准测试球的安装偏心对回转轴径向误差运动圆图象的影响。
An analysis is given to the effect of centering error of the mechanical mounting of the master ball in a digital measurement upon the radial motion polar plot of an axis of rotation.
后来，玉晶公主相思过度，悲伤而死。在她泪珠洒落的地方，长出一棵棵带刺的花树，开的花象火一样红，结的果象球一样圆。
Where her tears were shed, trees with thorns grew with flowers as red as fire, and fruits like round orbs.
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