According to theorem of motion of centre of mass and theorem of moment of momentum about centre of mass, we derive the theorem of moment of momentum about instantaneous center of rotation.

从质心运动定理和相对质心的动量矩定理出发，导出了相对瞬心的动量矩定理。

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The results show that the motion of atomic mass centre leads to the periodic evolution of the dynamics of the field phase and this period depends on the field mode structure parameter.

结果表明：原子质心运动导致场相位动力学的周期性演化，场模结构参数决定其周期的大小。

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