本文研究了怕对称刚-弹系统在重力场中的定点运动。

The problem of fixed-point motion of symmetrical rigid-elastic system in gravitational field is studied in this paper.

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在回旋时，马体环绕著一个定点运动，内方后肢维持靠近这个定点，以清楚的四节拍踏进。

During the turn, the horse moves around a point whereby the inner hind leg remains close to that point while stepping around the point in a clear four-beat rhythm.

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旋度实际上衡量的是，在任意给定点,运动旋转角速度的两倍。

The curl actually measures twice the angular speed of a rotation part of a motion at any given point.

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