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.
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。
Line block: a relief plate produced from a line drawing.
线条凸版：用线条画所制成的凸版。
Line block a relief plate produced from a line drawing.
线条凸版用线条画所制成的凸版。
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