The dangerous value of the control parameter led to surf-riding and the domain of periodicmotion and surf-riding given.
控制参数的危险值导致滑行，并给出了周期性运动和滑行的范围。
2
Long long ago, we knew the periodicmotion of a planet.
很久以前，我们就知道行星的周期运动。
3
This paper presents an efficient numerical scheme for calculating the periodicmotion of a harmonically forced piecewise linear oscillator very accurately.