作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
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.
适当地选择其结构参数，可使它产生任意的平面运动轨迹。
To properly select the structure parameter, the locus generator can generate arbitrary plane movement locus.
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