For sliding and overturning stability the system shall be assumed to act as a rigid body.

对于滑动和倾覆稳定性，系统应被假设为一刚体。

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Spatial motion of a rigid body can be seen as a screw motion of the body along a specific axis.

任一刚体的空间运动都可以视为沿某一轴线作螺旋运动。

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Quaternion is used to describe the orientation of a rigid body, and attitude motion is modelled.

采用四元数描述刚体姿态，建立了刚体姿态运动的数学模型。

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Even there, a horse is not really a rigid body, unless it's been dead for a long time.

马甚至都不是真正的刚体,除非是死了很长时间了

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