Automatic filter paper-type smoke meter for diesel vehicles free of tobacco smoke accelerate the state measurement.
全自动滤纸式烟度计，用于柴油车自由加速状态下排烟的烟度测量。
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.