The paper analyzes the mathematic model of the mill, points out that the reason causing the vibration is the rolling disturbance.
文章分析了轧机的数学模型，指出轧钢扰动是造成轧机扭振的原因。
Moreover, it is difficult to using the function model to describing the road traffic accident and the reason causing it for their multi-factors, the complex misalignment relations characteristic.
另外，由于道路交通事故与其致因之间呈现多因素、复杂的非线性关系的特点难以用函数模型来描述。
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