Very special books are still occasionally produced on vellum, but they are one-of-a-kind show pieces.
非常特别的书仍然偶尔用牛皮纸制作，但它们是独一无二的展示品。
2
Printing with moveable type on paper dramatically reduced the cost of producing a book compared with the old-fashioned ones handwritten on vellum, which comes from sheepskin.
羊皮纸是用羊皮制作的，与在羊皮纸上手写的老式方法相比，在纸上进行活字印刷大大降低了生产书籍的成本。
3
Printing with a moveable type on paper dramatically reduced the cost of producing a book compared with the old-fashioned ones handwritten on vellum, which comes from sheepskin.