The dangerous value of the control parameter led to surf-riding and the domain of periodic motion 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。

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The dangerous value of control parameter which leaded to surf-riding and the domain of periodic motion and surf-riding were given.

给出了导致骑浪发生的危险临界参数值，以及周期运动和骑浪运动区域划分。

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Chris Griffiths, 41, of Upper Killay, Swansea, is a two-times European surf champion and was on hand to demonstrate the art of riding a wave to the royal couple.

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