求翻译：由于二十辊轧机的系统结构复杂，同时与轧制工艺参数耦合，还受到张力、压下量等控制精度因素等影响，所以二十辊轧机的振痕振动的控制与预测是钢铁生产技术的一个世界难题，是制约高水平不锈钢带钢产品的技术瓶颈。是什么意思？

20th-roll mill complex structure, coupled with the rolling process parameters, but also by the tension, reduction and control accuracy and impact, vibration control and prediction of the oscillation marks 20-roller mill steel production technology a world problem, the constraints of the technical bo

Because of the system 20 roller-mill complex structure, and coupling to the rolling process parameters, they are under tension, pressure, volume control, such as precision factors, so 20 roller mills marks of vibration control and prediction is iron and steel production technology of the world's pro

Because 20 roll system structures are complex, simultaneously with rolling craft parameter coupling, but also quantity and so on receives the tensity, depress influences and so on control precision factors, therefore 20 rolls inspire the mark vibration the control and the forecast are steel and iron

Because the system structure 20-high rolling mill complex, and coupling of rolling process parameters, control accuracy factors such as amount of tension, pressure, etc, so 20-high rolling mill vibration and vibration control and prediction of trace iron and steel production technology is a world pr

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