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.

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。

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Here's a simple tip that will help you master this shot: Practice hitting low volleys with a tennis ball placed under your hitting arm.

这里有一个小窍门帮助你掌握这种击球方法：夹一个网球在你击球胳膊的腋下来练习低位截击。

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The basic skills area is a large facility with ample room for your players to master pitchers 'fielding, infield ball handling, outfield communication, catching, and team defense (see figure 12. 1).

基本技能训练区，如12.1所示，是一个较大的训练空间，可以进行投球守备，内野球处理，外野交流，捕球和球队防守训练。

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On his follow through, he looks more like a power-hitter muscling a drive into the right-centerfield gap than a master ball-striker like Vijay Singh.

WSJ: Peter Uihlein's Masters Debut Raises Questions About Golf's Talent Pipeline

The Little Master almost always hits the ball with little effort with a classic straight bat.

BBC: Introduction