The motor drives a gear at the top of the tail, causing the tail to swing back and forth, which propels the robot upward.

发动机带动机器人尾巴顶部的齿轮，引导尾巴前后摇摆，推动其上升。

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By raising your legs at the top of each swing, you can raise the overall center of mass of your body, effectively raising the height of your swing.

通过每次在当秋千时的最高点伸直你的腿可以使你全身的质心升高，这样就能有效地增大你晃动时的高度。

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The rocking is the main part of seismic acceleration at the top of super structure, the swing takes the second place, and elastic deformation is quite small.

上部结构柱顶加速度反应主要由基础转动引起的摆动分量组成，平动分量次之，而弹性变形分量很小。

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They made up 53% of the electorate in the 2008 presidential election, and women's top concerns -- including health care and education -- are at the heart of swing voters' concerns.

WSJ: Guys Left Behind