在这个体系中，力系简化是关键，简化为一个力和一个力偶。

The key in this system lies in simplifying it into a force and a couple.

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给出了解决刚体平面平行运动问题的一组完整方程，讨论了力系简化在质心平面内的条件。

A integrated equation set for solving plane parallel motion of rigid body was derived, and the conditions of system of forces simplified on the center of mass plane was discussed.

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将造波水槽内二维浮体牵引弹簧回复液压缸的受力系统简化为弹簧—质量—阻尼器系统，建立数学模型，并根据牛顿第二定律得到运动方程式。

The model of a kind of wave energy device moored on seabed is simplified into a spring-mass-damping system, and then its motion equation is built according to Newton's second law.

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