trac·ing pa·per
noun/ˈtreɪsɪŋ peɪpə(r)/
/ˈtreɪsɪŋ peɪpər/
[uncountable]- strong transparent paper (= that you can see through) that is placed on top of a drawing, etc. so that you can follow the lines with a pen or pencil in order to make a copy of it
描图纸；摹图纸