舰船运动的阻尼和刚度非线性，导致舰船大幅运动时横摇和纵摇之间的耦合。
The nonlinear damping and stiffness of a ship motion result in the coupling between rolling and pitch in big amplitude.
船舶运动时的阻尼和刚度非线性，导致船舶大幅运动时横摇和纵摇之间的耦合。
The nonlinear damping and stiffness of a ship motion in the seas result in the coupling motion between rolling and pitch in big amplitude.
两个谐波响应的迭加，使横摇和纵摇运动响应显著增加，并且横摇运动不再左右对称。
Due to the superposition of two responses with different frequencies, the ship motion is increased and the rolling motion is not symmetrical.
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