详细解释:n. 校对助手, 副本土地保有者
英语解释：
名词 copyholder:
mechanical device used in printing; holds the copy for the compositor详细解释：
cop.y.hold.er
n.（名词）An assistant who reads manuscript aloud to a proofreader.校对助手：向校对员大声读原稿的助手A device that holds copy in place, especially for a typesetter.原稿架：一种固定稿件的装置，尤指为排字工人设置的