动力学是一个专业用语。它是关于运动，能量，与力的科学研究。
Dynamics is a technical term. It is the scientific study of motion, energy, and forces.
而速度就是力的作用与能量使得物体发行运动的变化情况。
And speed is power and energy issue that the change of motion of the object.
网球运动是力与美的结合。
平衡木竞赛中的成功与失败往往与运动员的注意力息息相关。
Attention is closely related to success or failure in contest of balance beam.
平衡木竞赛中的成功与失败往往与运动员的注意力息息相关。
Attention is closely related to success or failure in contest of balance beam.
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