外脚背踢球可以施加很大的力，球的初速可能超过30m/s（70mph）。

Kicking it with the outside of his foot allowed him to hit the ball hard, at probably over 30 ms–1 (70 mph).

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结论：球帽型附着体与冠外附着体的联合设计形式具有临床实用价值。

Conclusions: Combined design of stud type attachments and extracoronal attachments had practically value in clinical appliance.

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实验时采用已知rcs值的标准金属球作为定标体，使用相对定标法对系统进行外定标实验，得到定标数据。

A standard metal ball with known RCS value has been used as the calibration body in the external calibration experiment which used a relative calibration method and acquired the calibration data.

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Except for electromagnetism, the basics of mechanics, which is the motion of Billiard balls and trucks and marbles and whatnot, was set up by Newton.

除电磁学外,力学的基础,也就是台球,卡车,弹球以及其它小玩意儿的运动原理,都是由牛顿建立起来的

耶鲁公开课 - 基础物理课程节选