求翻译：碾压法需要较大的工作面，而本文模型槽的宽度仅40cm，适合这样工作面的碾压设备较难购买，同时工作面狭小造成碾压设备很难施展，可操作性不强；是什么意思？

Rolling method requires a large face, and this model is only the width of slot 40cm, for this is more difficult to face the rolling equipment to buy, and face caused by rolling equipment is difficult to display small, operability is not strong;

Laminate larger coverage, and this article models of slot width of just 40 cm, suitable for this utopia of crushing equipment is more difficult to purchase from small size, and at the same time evolves crushing equipment is very difficult to maneuver, operability is not strong.

The roller compaction law needs the big working surface, but this article mold die width only 40cm, suits such working surface the roller compaction equipment to be difficult to purchase, simultaneously the working surface creates the roller compaction equipment to be very difficult narrow and small

Rolling method requires a large face, and this model slot width is 40cm only, suitable for rolling devices face more difficult to buy, at the coal face caused by small rolling equipment is difficult to practise, operability is not strong;

Rolling method requires a large face, and this model slot width is 40cm only, suitable for rolling devices face more difficult to buy, at the coal face caused by small rolling equipment is difficult to practise, operability is not strong;