The motion at this time scale is clearly dominated by the lightly damped phugoid. 采用这种时间尺度时,运动显然由小阻尼的沉浮模态所决定。
Express the differences of displacement variation of a mass subjected by a free damped vibration and a forced vibration, separately. 分别叙述一质量受到无阻尼的振动与强制振动时位移变化的不同。