一般不打样，只凭构思绘画，也不用直尺和圆规，所画的中行线、直线和方圆图形，折叠起来能吻合不差；

Generally no proof, just by the idea of painting, no a ruler and compass, but the Bank lines, straight lines and radius of graphics fold up to fit correctly ;

youdao

一般不打样，只凭构思绘画，也不用直尺和圆规，所画的中行线、直线和方圆图形，折叠起来能吻合不差；

Generally no proof, just by the idea of painting, no a ruler and compass, but the Bank lines, straight lines and radius of graphics fold up to fit correctly ;

youdao