Terms for subject Polygraphy containing back-up

English	Chinese
back to back; back-up; backing-up ; perfect up ; perfect- ing; printing the verso ; reiteration ; second impression ; second printing	印反面
back-up cylinder	后顶压滚筒
back-up materials	衬材
back-up register	正反面对准［双面印刷］
back-up roll; back-up roller; backer roll	加压辊［凹印］