Positive line work and letterpress must be opaque.
阳像线划原图和注记必须是不透明的。
Letterpress involves a direct contact between the type and other items being printed and paper.
凸版印刷是一种字模或其他母体与纸张直接接触的印刷工艺。
In printing, a duplicate letterpress plate made from an original by electroplating.
在印刷技术中, 一种用电镀方法从原版复制成的印刷版.