铺设莱板，钢板或其他重金属，用量角器，圆规和绘图工具或模板在工件上标记弯曲和切割线。
Lay out plate, sheet steel or other heavy metal and mark bending and cutting lines on work piece using protractors, compasses and drawing instruments or templates.
转圈的不是圆规，而是绘图者。
It is not the compass that makes the circle, but the draftsman "."
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