Three-knife trimmer: A guillotine designed with three knives for trimming sizeable stacks of books or magazines. One trim removes the feet and heads and another the foredge.

• 三刀切书机:设计用来裁切适量书本或杂志边缘的切纸机。先用两刀，同时裁去头脚书边；再加一刀，裁去切口书边。