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这段话应该怎么翻译,谢谢

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这段话应该怎么翻译,谢谢
One vital disadvantage of these mills is that the rolls of all stands run at the same speed. Therefore, it is impossible in these mills to roll the bar at a speed that
increases as the length of the bar increases when it is successively reduced.
This feature and also the fact that the output of rolling mills can be increased with higher differentiation of the production process are the reasons why roll stands were subsequently designed in several lines.
材料工程方面的,谢绝机译
这段话应该怎么翻译,谢谢
这种轧机有一个很要命的缺陷:所有轧轴都是以相同速度转动的.因此,当钢条在轧机中持续受到挤压而长度伸长时,这类轧机是无法使运转速度也随之增长的.
这种死板的特性,加上随着生产工序的更高差异化、轧机的输出也需要随之增加,这就是为什么轧机一般设计成多条流水线的原因.