The equation of motion of particles has been reduced to the pendulum equation with a damping term and a forced term by using the sine_squared potential.
利用正弦平方势，把粒子运动方程化为具有运动阻尼和周期调制的摆方程。
The motion of spherical pendulum in z-direction is described by nonlinear oscillation equation.
用非线性振动方程描述了球摆在 z 方向上的运动。
So I go to this equation, and so I ask, what is the period of a pendulum?
所以得到一个方程，那我问，摆的周期是多少？
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